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cdc_ncm: fix divide-by-zero caused by invalid wMaxPacketSize
[linux/fpc-iii.git] / drivers / net / usb / cdc_ncm.c
blob00cab3f43a4ca3f3e91f1471f5ab189e78d601dc
1 /*
2 * cdc_ncm.c
3 *
4 * Copyright (C) ST-Ericsson 2010-2012
5 * Contact: Alexey Orishko <alexey.orishko@stericsson.com>
6 * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com>
7 *
8 * USB Host Driver for Network Control Model (NCM)
9 * http://www.usb.org/developers/docs/devclass_docs/NCM10_012011.zip
10 *
11 * The NCM encoding, decoding and initialization logic
12 * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h
13 *
14 * This software is available to you under a choice of one of two
15 * licenses. You may choose this file to be licensed under the terms
16 * of the GNU General Public License (GPL) Version 2 or the 2-clause
17 * BSD license listed below:
18 *
19 * Redistribution and use in source and binary forms, with or without
20 * modification, are permitted provided that the following conditions
21 * are met:
22 * 1. Redistributions of source code must retain the above copyright
23 * notice, this list of conditions and the following disclaimer.
24 * 2. Redistributions in binary form must reproduce the above copyright
25 * notice, this list of conditions and the following disclaimer in the
26 * documentation and/or other materials provided with the distribution.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41 #include <linux/module.h>
42 #include <linux/netdevice.h>
43 #include <linux/ctype.h>
44 #include <linux/etherdevice.h>
45 #include <linux/ethtool.h>
46 #include <linux/workqueue.h>
47 #include <linux/mii.h>
48 #include <linux/crc32.h>
49 #include <linux/usb.h>
50 #include <linux/hrtimer.h>
51 #include <linux/atomic.h>
52 #include <linux/usb/usbnet.h>
53 #include <linux/usb/cdc.h>
54 #include <linux/usb/cdc_ncm.h>
55
56 #if IS_ENABLED(CONFIG_USB_NET_CDC_MBIM)
57 static bool prefer_mbim = true;
58 #else
59 static bool prefer_mbim;
60 #endif
61 module_param(prefer_mbim, bool, 0644);
62 MODULE_PARM_DESC(prefer_mbim, "Prefer MBIM setting on dual NCM/MBIM functions");
63
64 static void cdc_ncm_txpath_bh(unsigned long param);
65 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx);
66 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer);
67 static struct usb_driver cdc_ncm_driver;
68
69 struct cdc_ncm_stats {
70 char stat_string[ETH_GSTRING_LEN];
71 int sizeof_stat;
72 int stat_offset;
73 };
74
75 #define CDC_NCM_STAT(str, m) { \
76 .stat_string = str, \
77 .sizeof_stat = sizeof(((struct cdc_ncm_ctx *)0)->m), \
78 .stat_offset = offsetof(struct cdc_ncm_ctx, m) }
79 #define CDC_NCM_SIMPLE_STAT(m) CDC_NCM_STAT(__stringify(m), m)
80
81 static const struct cdc_ncm_stats cdc_ncm_gstrings_stats[] = {
82 CDC_NCM_SIMPLE_STAT(tx_reason_ntb_full),
83 CDC_NCM_SIMPLE_STAT(tx_reason_ndp_full),
84 CDC_NCM_SIMPLE_STAT(tx_reason_timeout),
85 CDC_NCM_SIMPLE_STAT(tx_reason_max_datagram),
86 CDC_NCM_SIMPLE_STAT(tx_overhead),
87 CDC_NCM_SIMPLE_STAT(tx_ntbs),
88 CDC_NCM_SIMPLE_STAT(rx_overhead),
89 CDC_NCM_SIMPLE_STAT(rx_ntbs),
90 };
91
92 #define CDC_NCM_LOW_MEM_MAX_CNT 10
93
94 static int cdc_ncm_get_sset_count(struct net_device __always_unused *netdev, int sset)
95 {
96 switch (sset) {
97 case ETH_SS_STATS:
98 return ARRAY_SIZE(cdc_ncm_gstrings_stats);
99 default:
100 return -EOPNOTSUPP;
101 }
102 }
103
104 static void cdc_ncm_get_ethtool_stats(struct net_device *netdev,
105 struct ethtool_stats __always_unused *stats,
106 u64 *data)
107 {
108 struct usbnet *dev = netdev_priv(netdev);
109 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
110 int i;
111 char *p = NULL;
112
113 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
114 p = (char *)ctx + cdc_ncm_gstrings_stats[i].stat_offset;
115 data[i] = (cdc_ncm_gstrings_stats[i].sizeof_stat == sizeof(u64)) ? *(u64 *)p : *(u32 *)p;
116 }
117 }
118
119 static void cdc_ncm_get_strings(struct net_device __always_unused *netdev, u32 stringset, u8 *data)
120 {
121 u8 *p = data;
122 int i;
123
124 switch (stringset) {
125 case ETH_SS_STATS:
126 for (i = 0; i < ARRAY_SIZE(cdc_ncm_gstrings_stats); i++) {
127 memcpy(p, cdc_ncm_gstrings_stats[i].stat_string, ETH_GSTRING_LEN);
128 p += ETH_GSTRING_LEN;
129 }
130 }
131 }
132
133 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx);
134
135 static const struct ethtool_ops cdc_ncm_ethtool_ops = {
136 .get_link = usbnet_get_link,
137 .nway_reset = usbnet_nway_reset,
138 .get_drvinfo = usbnet_get_drvinfo,
139 .get_msglevel = usbnet_get_msglevel,
140 .set_msglevel = usbnet_set_msglevel,
141 .get_ts_info = ethtool_op_get_ts_info,
142 .get_sset_count = cdc_ncm_get_sset_count,
143 .get_strings = cdc_ncm_get_strings,
144 .get_ethtool_stats = cdc_ncm_get_ethtool_stats,
145 .get_link_ksettings = usbnet_get_link_ksettings,
146 .set_link_ksettings = usbnet_set_link_ksettings,
147 };
148
149 static u32 cdc_ncm_check_rx_max(struct usbnet *dev, u32 new_rx)
150 {
151 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
152 u32 val, max, min;
153
154 /* clamp new_rx to sane values */
155 min = USB_CDC_NCM_NTB_MIN_IN_SIZE;
156 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_RX, le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
157
158 /* dwNtbInMaxSize spec violation? Use MIN size for both limits */
159 if (max < min) {
160 dev_warn(&dev->intf->dev, "dwNtbInMaxSize=%u is too small. Using %u\n",
161 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize), min);
162 max = min;
163 }
164
165 val = clamp_t(u32, new_rx, min, max);
166 if (val != new_rx)
167 dev_dbg(&dev->intf->dev, "rx_max must be in the [%u, %u] range\n", min, max);
168
169 return val;
170 }
171
172 static u32 cdc_ncm_check_tx_max(struct usbnet *dev, u32 new_tx)
173 {
174 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
175 u32 val, max, min;
176
177 /* clamp new_tx to sane values */
178 min = ctx->max_datagram_size + ctx->max_ndp_size + sizeof(struct usb_cdc_ncm_nth16);
179 max = min_t(u32, CDC_NCM_NTB_MAX_SIZE_TX, le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
180
181 /* some devices set dwNtbOutMaxSize too low for the above default */
182 min = min(min, max);
183
184 val = clamp_t(u32, new_tx, min, max);
185 if (val != new_tx)
186 dev_dbg(&dev->intf->dev, "tx_max must be in the [%u, %u] range\n", min, max);
187
188 return val;
189 }
190
191 static ssize_t cdc_ncm_show_min_tx_pkt(struct device *d, struct device_attribute *attr, char *buf)
192 {
193 struct usbnet *dev = netdev_priv(to_net_dev(d));
194 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
195
196 return sprintf(buf, "%u\n", ctx->min_tx_pkt);
197 }
198
199 static ssize_t cdc_ncm_show_rx_max(struct device *d, struct device_attribute *attr, char *buf)
200 {
201 struct usbnet *dev = netdev_priv(to_net_dev(d));
202 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
203
204 return sprintf(buf, "%u\n", ctx->rx_max);
205 }
206
207 static ssize_t cdc_ncm_show_tx_max(struct device *d, struct device_attribute *attr, char *buf)
208 {
209 struct usbnet *dev = netdev_priv(to_net_dev(d));
210 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
211
212 return sprintf(buf, "%u\n", ctx->tx_max);
213 }
214
215 static ssize_t cdc_ncm_show_tx_timer_usecs(struct device *d, struct device_attribute *attr, char *buf)
216 {
217 struct usbnet *dev = netdev_priv(to_net_dev(d));
218 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
219
220 return sprintf(buf, "%u\n", ctx->timer_interval / (u32)NSEC_PER_USEC);
221 }
222
223 static ssize_t cdc_ncm_store_min_tx_pkt(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
224 {
225 struct usbnet *dev = netdev_priv(to_net_dev(d));
226 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
227 unsigned long val;
228
229 /* no need to restrict values - anything from 0 to infinity is OK */
230 if (kstrtoul(buf, 0, &val))
231 return -EINVAL;
232
233 ctx->min_tx_pkt = val;
234 return len;
235 }
236
237 static ssize_t cdc_ncm_store_rx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
238 {
239 struct usbnet *dev = netdev_priv(to_net_dev(d));
240 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
241 unsigned long val;
242
243 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_rx_max(dev, val) != val)
244 return -EINVAL;
245
246 cdc_ncm_update_rxtx_max(dev, val, ctx->tx_max);
247 return len;
248 }
249
250 static ssize_t cdc_ncm_store_tx_max(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
251 {
252 struct usbnet *dev = netdev_priv(to_net_dev(d));
253 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
254 unsigned long val;
255
256 if (kstrtoul(buf, 0, &val) || cdc_ncm_check_tx_max(dev, val) != val)
257 return -EINVAL;
258
259 cdc_ncm_update_rxtx_max(dev, ctx->rx_max, val);
260 return len;
261 }
262
263 static ssize_t cdc_ncm_store_tx_timer_usecs(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
264 {
265 struct usbnet *dev = netdev_priv(to_net_dev(d));
266 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
267 ssize_t ret;
268 unsigned long val;
269
270 ret = kstrtoul(buf, 0, &val);
271 if (ret)
272 return ret;
273 if (val && (val < CDC_NCM_TIMER_INTERVAL_MIN || val > CDC_NCM_TIMER_INTERVAL_MAX))
274 return -EINVAL;
275
276 spin_lock_bh(&ctx->mtx);
277 ctx->timer_interval = val * NSEC_PER_USEC;
278 if (!ctx->timer_interval)
279 ctx->tx_timer_pending = 0;
280 spin_unlock_bh(&ctx->mtx);
281 return len;
282 }
283
284 static DEVICE_ATTR(min_tx_pkt, 0644, cdc_ncm_show_min_tx_pkt, cdc_ncm_store_min_tx_pkt);
285 static DEVICE_ATTR(rx_max, 0644, cdc_ncm_show_rx_max, cdc_ncm_store_rx_max);
286 static DEVICE_ATTR(tx_max, 0644, cdc_ncm_show_tx_max, cdc_ncm_store_tx_max);
287 static DEVICE_ATTR(tx_timer_usecs, 0644, cdc_ncm_show_tx_timer_usecs, cdc_ncm_store_tx_timer_usecs);
288
289 static ssize_t ndp_to_end_show(struct device *d, struct device_attribute *attr, char *buf)
290 {
291 struct usbnet *dev = netdev_priv(to_net_dev(d));
292 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
293
294 return sprintf(buf, "%c\n", ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END ? 'Y' : 'N');
295 }
296
297 static ssize_t ndp_to_end_store(struct device *d, struct device_attribute *attr, const char *buf, size_t len)
298 {
299 struct usbnet *dev = netdev_priv(to_net_dev(d));
300 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
301 bool enable;
302
303 if (strtobool(buf, &enable))
304 return -EINVAL;
305
306 /* no change? */
307 if (enable == (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
308 return len;
309
310 if (enable && !ctx->delayed_ndp16) {
311 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
312 if (!ctx->delayed_ndp16)
313 return -ENOMEM;
314 }
315
316 /* flush pending data before changing flag */
317 netif_tx_lock_bh(dev->net);
318 usbnet_start_xmit(NULL, dev->net);
319 spin_lock_bh(&ctx->mtx);
320 if (enable)
321 ctx->drvflags |= CDC_NCM_FLAG_NDP_TO_END;
322 else
323 ctx->drvflags &= ~CDC_NCM_FLAG_NDP_TO_END;
324 spin_unlock_bh(&ctx->mtx);
325 netif_tx_unlock_bh(dev->net);
326
327 return len;
328 }
329 static DEVICE_ATTR_RW(ndp_to_end);
330
331 #define NCM_PARM_ATTR(name, format, tocpu) \
332 static ssize_t cdc_ncm_show_##name(struct device *d, struct device_attribute *attr, char *buf) \
333 { \
334 struct usbnet *dev = netdev_priv(to_net_dev(d)); \
335 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; \
336 return sprintf(buf, format "\n", tocpu(ctx->ncm_parm.name)); \
337 } \
338 static DEVICE_ATTR(name, 0444, cdc_ncm_show_##name, NULL)
339
340 NCM_PARM_ATTR(bmNtbFormatsSupported, "0x%04x", le16_to_cpu);
341 NCM_PARM_ATTR(dwNtbInMaxSize, "%u", le32_to_cpu);
342 NCM_PARM_ATTR(wNdpInDivisor, "%u", le16_to_cpu);
343 NCM_PARM_ATTR(wNdpInPayloadRemainder, "%u", le16_to_cpu);
344 NCM_PARM_ATTR(wNdpInAlignment, "%u", le16_to_cpu);
345 NCM_PARM_ATTR(dwNtbOutMaxSize, "%u", le32_to_cpu);
346 NCM_PARM_ATTR(wNdpOutDivisor, "%u", le16_to_cpu);
347 NCM_PARM_ATTR(wNdpOutPayloadRemainder, "%u", le16_to_cpu);
348 NCM_PARM_ATTR(wNdpOutAlignment, "%u", le16_to_cpu);
349 NCM_PARM_ATTR(wNtbOutMaxDatagrams, "%u", le16_to_cpu);
350
351 static struct attribute *cdc_ncm_sysfs_attrs[] = {
352 &dev_attr_min_tx_pkt.attr,
353 &dev_attr_ndp_to_end.attr,
354 &dev_attr_rx_max.attr,
355 &dev_attr_tx_max.attr,
356 &dev_attr_tx_timer_usecs.attr,
357 &dev_attr_bmNtbFormatsSupported.attr,
358 &dev_attr_dwNtbInMaxSize.attr,
359 &dev_attr_wNdpInDivisor.attr,
360 &dev_attr_wNdpInPayloadRemainder.attr,
361 &dev_attr_wNdpInAlignment.attr,
362 &dev_attr_dwNtbOutMaxSize.attr,
363 &dev_attr_wNdpOutDivisor.attr,
364 &dev_attr_wNdpOutPayloadRemainder.attr,
365 &dev_attr_wNdpOutAlignment.attr,
366 &dev_attr_wNtbOutMaxDatagrams.attr,
367 NULL,
368 };
369
370 static const struct attribute_group cdc_ncm_sysfs_attr_group = {
371 .name = "cdc_ncm",
372 .attrs = cdc_ncm_sysfs_attrs,
373 };
374
375 /* handle rx_max and tx_max changes */
376 static void cdc_ncm_update_rxtx_max(struct usbnet *dev, u32 new_rx, u32 new_tx)
377 {
378 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
379 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
380 u32 val;
381
382 val = cdc_ncm_check_rx_max(dev, new_rx);
383
384 /* inform device about NTB input size changes */
385 if (val != ctx->rx_max) {
386 __le32 dwNtbInMaxSize = cpu_to_le32(val);
387
388 dev_info(&dev->intf->dev, "setting rx_max = %u\n", val);
389
390 /* tell device to use new size */
391 if (usbnet_write_cmd(dev, USB_CDC_SET_NTB_INPUT_SIZE,
392 USB_TYPE_CLASS | USB_DIR_OUT
393 | USB_RECIP_INTERFACE,
394 0, iface_no, &dwNtbInMaxSize, 4) < 0)
395 dev_dbg(&dev->intf->dev, "Setting NTB Input Size failed\n");
396 else
397 ctx->rx_max = val;
398 }
399
400 /* usbnet use these values for sizing rx queues */
401 if (dev->rx_urb_size != ctx->rx_max) {
402 dev->rx_urb_size = ctx->rx_max;
403 if (netif_running(dev->net))
404 usbnet_unlink_rx_urbs(dev);
405 }
406
407 val = cdc_ncm_check_tx_max(dev, new_tx);
408 if (val != ctx->tx_max)
409 dev_info(&dev->intf->dev, "setting tx_max = %u\n", val);
410
411 /* Adding a pad byte here if necessary simplifies the handling
412 * in cdc_ncm_fill_tx_frame, making tx_max always represent
413 * the real skb max size.
414 *
415 * We cannot use dev->maxpacket here because this is called from
416 * .bind which is called before usbnet sets up dev->maxpacket
417 */
418 if (val != le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize) &&
419 val % usb_maxpacket(dev->udev, dev->out, 1) == 0)
420 val++;
421
422 /* we might need to flush any pending tx buffers if running */
423 if (netif_running(dev->net) && val > ctx->tx_max) {
424 netif_tx_lock_bh(dev->net);
425 usbnet_start_xmit(NULL, dev->net);
426 /* make sure tx_curr_skb is reallocated if it was empty */
427 if (ctx->tx_curr_skb) {
428 dev_kfree_skb_any(ctx->tx_curr_skb);
429 ctx->tx_curr_skb = NULL;
430 }
431 ctx->tx_max = val;
432 netif_tx_unlock_bh(dev->net);
433 } else {
434 ctx->tx_max = val;
435 }
436
437 dev->hard_mtu = ctx->tx_max;
438
439 /* max qlen depend on hard_mtu and rx_urb_size */
440 usbnet_update_max_qlen(dev);
441
442 /* never pad more than 3 full USB packets per transfer */
443 ctx->min_tx_pkt = clamp_t(u16, ctx->tx_max - 3 * usb_maxpacket(dev->udev, dev->out, 1),
444 CDC_NCM_MIN_TX_PKT, ctx->tx_max);
445 }
446
447 /* helpers for NCM and MBIM differences */
448 static u8 cdc_ncm_flags(struct usbnet *dev)
449 {
450 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
451
452 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
453 return ctx->mbim_desc->bmNetworkCapabilities;
454 if (ctx->func_desc)
455 return ctx->func_desc->bmNetworkCapabilities;
456 return 0;
457 }
458
459 static int cdc_ncm_eth_hlen(struct usbnet *dev)
460 {
461 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
462 return 0;
463 return ETH_HLEN;
464 }
465
466 static u32 cdc_ncm_min_dgram_size(struct usbnet *dev)
467 {
468 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting))
469 return CDC_MBIM_MIN_DATAGRAM_SIZE;
470 return CDC_NCM_MIN_DATAGRAM_SIZE;
471 }
472
473 static u32 cdc_ncm_max_dgram_size(struct usbnet *dev)
474 {
475 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
476
477 if (cdc_ncm_comm_intf_is_mbim(dev->intf->cur_altsetting) && ctx->mbim_desc)
478 return le16_to_cpu(ctx->mbim_desc->wMaxSegmentSize);
479 if (ctx->ether_desc)
480 return le16_to_cpu(ctx->ether_desc->wMaxSegmentSize);
481 return CDC_NCM_MAX_DATAGRAM_SIZE;
482 }
483
484 /* initial one-time device setup. MUST be called with the data interface
485 * in altsetting 0
486 */
487 static int cdc_ncm_init(struct usbnet *dev)
488 {
489 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
490 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
491 int err;
492
493 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_PARAMETERS,
494 USB_TYPE_CLASS | USB_DIR_IN
495 |USB_RECIP_INTERFACE,
496 0, iface_no, &ctx->ncm_parm,
497 sizeof(ctx->ncm_parm));
498 if (err < 0) {
499 dev_err(&dev->intf->dev, "failed GET_NTB_PARAMETERS\n");
500 return err; /* GET_NTB_PARAMETERS is required */
501 }
502
503 /* set CRC Mode */
504 if (cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_CRC_MODE) {
505 dev_dbg(&dev->intf->dev, "Setting CRC mode off\n");
506 err = usbnet_write_cmd(dev, USB_CDC_SET_CRC_MODE,
507 USB_TYPE_CLASS | USB_DIR_OUT
508 | USB_RECIP_INTERFACE,
509 USB_CDC_NCM_CRC_NOT_APPENDED,
510 iface_no, NULL, 0);
511 if (err < 0)
512 dev_err(&dev->intf->dev, "SET_CRC_MODE failed\n");
513 }
514
515 /* set NTB format, if both formats are supported.
516 *
517 * "The host shall only send this command while the NCM Data
518 * Interface is in alternate setting 0."
519 */
520 if (le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported) &
521 USB_CDC_NCM_NTB32_SUPPORTED) {
522 dev_dbg(&dev->intf->dev, "Setting NTB format to 16-bit\n");
523 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
524 USB_TYPE_CLASS | USB_DIR_OUT
525 | USB_RECIP_INTERFACE,
526 USB_CDC_NCM_NTB16_FORMAT,
527 iface_no, NULL, 0);
528 if (err < 0)
529 dev_err(&dev->intf->dev, "SET_NTB_FORMAT failed\n");
530 }
531
532 /* set initial device values */
533 ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize);
534 ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize);
535 ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder);
536 ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor);
537 ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment);
538 /* devices prior to NCM Errata shall set this field to zero */
539 ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams);
540
541 dev_dbg(&dev->intf->dev,
542 "dwNtbInMaxSize=%u dwNtbOutMaxSize=%u wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n",
543 ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus,
544 ctx->tx_ndp_modulus, ctx->tx_max_datagrams, cdc_ncm_flags(dev));
545
546 /* max count of tx datagrams */
547 if ((ctx->tx_max_datagrams == 0) ||
548 (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX))
549 ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX;
550
551 /* set up maximum NDP size */
552 ctx->max_ndp_size = sizeof(struct usb_cdc_ncm_ndp16) + (ctx->tx_max_datagrams + 1) * sizeof(struct usb_cdc_ncm_dpe16);
553
554 /* initial coalescing timer interval */
555 ctx->timer_interval = CDC_NCM_TIMER_INTERVAL_USEC * NSEC_PER_USEC;
556
557 return 0;
558 }
559
560 /* set a new max datagram size */
561 static void cdc_ncm_set_dgram_size(struct usbnet *dev, int new_size)
562 {
563 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
564 u8 iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber;
565 __le16 max_datagram_size;
566 u16 mbim_mtu;
567 int err;
568
569 /* set default based on descriptors */
570 ctx->max_datagram_size = clamp_t(u32, new_size,
571 cdc_ncm_min_dgram_size(dev),
572 CDC_NCM_MAX_DATAGRAM_SIZE);
573
574 /* inform the device about the selected Max Datagram Size? */
575 if (!(cdc_ncm_flags(dev) & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE))
576 goto out;
577
578 /* read current mtu value from device */
579 err = usbnet_read_cmd(dev, USB_CDC_GET_MAX_DATAGRAM_SIZE,
580 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
581 0, iface_no, &max_datagram_size, 2);
582 if (err < 0) {
583 dev_dbg(&dev->intf->dev, "GET_MAX_DATAGRAM_SIZE failed\n");
584 goto out;
585 }
586
587 if (le16_to_cpu(max_datagram_size) == ctx->max_datagram_size)
588 goto out;
589
590 max_datagram_size = cpu_to_le16(ctx->max_datagram_size);
591 err = usbnet_write_cmd(dev, USB_CDC_SET_MAX_DATAGRAM_SIZE,
592 USB_TYPE_CLASS | USB_DIR_OUT | USB_RECIP_INTERFACE,
593 0, iface_no, &max_datagram_size, 2);
594 if (err < 0)
595 dev_dbg(&dev->intf->dev, "SET_MAX_DATAGRAM_SIZE failed\n");
596
597 out:
598 /* set MTU to max supported by the device if necessary */
599 dev->net->mtu = min_t(int, dev->net->mtu, ctx->max_datagram_size - cdc_ncm_eth_hlen(dev));
600
601 /* do not exceed operater preferred MTU */
602 if (ctx->mbim_extended_desc) {
603 mbim_mtu = le16_to_cpu(ctx->mbim_extended_desc->wMTU);
604 if (mbim_mtu != 0 && mbim_mtu < dev->net->mtu)
605 dev->net->mtu = mbim_mtu;
606 }
607 }
608
609 static void cdc_ncm_fix_modulus(struct usbnet *dev)
610 {
611 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
612 u32 val;
613
614 /*
615 * verify that the structure alignment is:
616 * - power of two
617 * - not greater than the maximum transmit length
618 * - not less than four bytes
619 */
620 val = ctx->tx_ndp_modulus;
621
622 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
623 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
624 dev_dbg(&dev->intf->dev, "Using default alignment: 4 bytes\n");
625 ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
626 }
627
628 /*
629 * verify that the payload alignment is:
630 * - power of two
631 * - not greater than the maximum transmit length
632 * - not less than four bytes
633 */
634 val = ctx->tx_modulus;
635
636 if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) ||
637 (val != ((-val) & val)) || (val >= ctx->tx_max)) {
638 dev_dbg(&dev->intf->dev, "Using default transmit modulus: 4 bytes\n");
639 ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE;
640 }
641
642 /* verify the payload remainder */
643 if (ctx->tx_remainder >= ctx->tx_modulus) {
644 dev_dbg(&dev->intf->dev, "Using default transmit remainder: 0 bytes\n");
645 ctx->tx_remainder = 0;
646 }
647
648 /* adjust TX-remainder according to NCM specification. */
649 ctx->tx_remainder = ((ctx->tx_remainder - cdc_ncm_eth_hlen(dev)) &
650 (ctx->tx_modulus - 1));
651 }
652
653 static int cdc_ncm_setup(struct usbnet *dev)
654 {
655 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
656 u32 def_rx, def_tx;
657
658 /* be conservative when selecting intial buffer size to
659 * increase the number of hosts this will work for
660 */
661 def_rx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_RX,
662 le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize));
663 def_tx = min_t(u32, CDC_NCM_NTB_DEF_SIZE_TX,
664 le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize));
665
666 /* clamp rx_max and tx_max and inform device */
667 cdc_ncm_update_rxtx_max(dev, def_rx, def_tx);
668
669 /* sanitize the modulus and remainder values */
670 cdc_ncm_fix_modulus(dev);
671
672 /* set max datagram size */
673 cdc_ncm_set_dgram_size(dev, cdc_ncm_max_dgram_size(dev));
674 return 0;
675 }
676
677 static void
678 cdc_ncm_find_endpoints(struct usbnet *dev, struct usb_interface *intf)
679 {
680 struct usb_host_endpoint *e, *in = NULL, *out = NULL;
681 u8 ep;
682
683 for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) {
684 e = intf->cur_altsetting->endpoint + ep;
685
686 /* ignore endpoints which cannot transfer data */
687 if (!usb_endpoint_maxp(&e->desc))
688 continue;
689
690 switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
691 case USB_ENDPOINT_XFER_INT:
692 if (usb_endpoint_dir_in(&e->desc)) {
693 if (!dev->status)
694 dev->status = e;
695 }
696 break;
697
698 case USB_ENDPOINT_XFER_BULK:
699 if (usb_endpoint_dir_in(&e->desc)) {
700 if (!in)
701 in = e;
702 } else {
703 if (!out)
704 out = e;
705 }
706 break;
707
708 default:
709 break;
710 }
711 }
712 if (in && !dev->in)
713 dev->in = usb_rcvbulkpipe(dev->udev,
714 in->desc.bEndpointAddress &
715 USB_ENDPOINT_NUMBER_MASK);
716 if (out && !dev->out)
717 dev->out = usb_sndbulkpipe(dev->udev,
718 out->desc.bEndpointAddress &
719 USB_ENDPOINT_NUMBER_MASK);
720 }
721
722 static void cdc_ncm_free(struct cdc_ncm_ctx *ctx)
723 {
724 if (ctx == NULL)
725 return;
726
727 if (ctx->tx_rem_skb != NULL) {
728 dev_kfree_skb_any(ctx->tx_rem_skb);
729 ctx->tx_rem_skb = NULL;
730 }
731
732 if (ctx->tx_curr_skb != NULL) {
733 dev_kfree_skb_any(ctx->tx_curr_skb);
734 ctx->tx_curr_skb = NULL;
735 }
736
737 kfree(ctx->delayed_ndp16);
738
739 kfree(ctx);
740 }
741
742 /* we need to override the usbnet change_mtu ndo for two reasons:
743 * - respect the negotiated maximum datagram size
744 * - avoid unwanted changes to rx and tx buffers
745 */
746 int cdc_ncm_change_mtu(struct net_device *net, int new_mtu)
747 {
748 struct usbnet *dev = netdev_priv(net);
749
750 net->mtu = new_mtu;
751 cdc_ncm_set_dgram_size(dev, new_mtu + cdc_ncm_eth_hlen(dev));
752
753 return 0;
754 }
755 EXPORT_SYMBOL_GPL(cdc_ncm_change_mtu);
756
757 static const struct net_device_ops cdc_ncm_netdev_ops = {
758 .ndo_open = usbnet_open,
759 .ndo_stop = usbnet_stop,
760 .ndo_start_xmit = usbnet_start_xmit,
761 .ndo_tx_timeout = usbnet_tx_timeout,
762 .ndo_get_stats64 = usbnet_get_stats64,
763 .ndo_change_mtu = cdc_ncm_change_mtu,
764 .ndo_set_mac_address = eth_mac_addr,
765 .ndo_validate_addr = eth_validate_addr,
766 };
767
768 int cdc_ncm_bind_common(struct usbnet *dev, struct usb_interface *intf, u8 data_altsetting, int drvflags)
769 {
770 struct cdc_ncm_ctx *ctx;
771 struct usb_driver *driver;
772 u8 *buf;
773 int len;
774 int temp;
775 int err;
776 u8 iface_no;
777 struct usb_cdc_parsed_header hdr;
778 __le16 curr_ntb_format;
779
780 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
781 if (!ctx)
782 return -ENOMEM;
783
784 hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
785 ctx->tx_timer.function = &cdc_ncm_tx_timer_cb;
786 tasklet_init(&ctx->bh, cdc_ncm_txpath_bh, (unsigned long)dev);
787 atomic_set(&ctx->stop, 0);
788 spin_lock_init(&ctx->mtx);
789
790 /* store ctx pointer in device data field */
791 dev->data[0] = (unsigned long)ctx;
792
793 /* only the control interface can be successfully probed */
794 ctx->control = intf;
795
796 /* get some pointers */
797 driver = driver_of(intf);
798 buf = intf->cur_altsetting->extra;
799 len = intf->cur_altsetting->extralen;
800
801 /* parse through descriptors associated with control interface */
802 cdc_parse_cdc_header(&hdr, intf, buf, len);
803
804 if (hdr.usb_cdc_union_desc)
805 ctx->data = usb_ifnum_to_if(dev->udev,
806 hdr.usb_cdc_union_desc->bSlaveInterface0);
807 ctx->ether_desc = hdr.usb_cdc_ether_desc;
808 ctx->func_desc = hdr.usb_cdc_ncm_desc;
809 ctx->mbim_desc = hdr.usb_cdc_mbim_desc;
810 ctx->mbim_extended_desc = hdr.usb_cdc_mbim_extended_desc;
811
812 /* some buggy devices have an IAD but no CDC Union */
813 if (!hdr.usb_cdc_union_desc && intf->intf_assoc && intf->intf_assoc->bInterfaceCount == 2) {
814 ctx->data = usb_ifnum_to_if(dev->udev, intf->cur_altsetting->desc.bInterfaceNumber + 1);
815 dev_dbg(&intf->dev, "CDC Union missing - got slave from IAD\n");
816 }
817
818 /* check if we got everything */
819 if (!ctx->data) {
820 dev_dbg(&intf->dev, "CDC Union missing and no IAD found\n");
821 goto error;
822 }
823 if (cdc_ncm_comm_intf_is_mbim(intf->cur_altsetting)) {
824 if (!ctx->mbim_desc) {
825 dev_dbg(&intf->dev, "MBIM functional descriptor missing\n");
826 goto error;
827 }
828 } else {
829 if (!ctx->ether_desc || !ctx->func_desc) {
830 dev_dbg(&intf->dev, "NCM or ECM functional descriptors missing\n");
831 goto error;
832 }
833 }
834
835 /* claim data interface, if different from control */
836 if (ctx->data != ctx->control) {
837 temp = usb_driver_claim_interface(driver, ctx->data, dev);
838 if (temp) {
839 dev_dbg(&intf->dev, "failed to claim data intf\n");
840 goto error;
841 }
842 }
843
844 iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber;
845
846 /* Device-specific flags */
847 ctx->drvflags = drvflags;
848
849 /* Reset data interface. Some devices will not reset properly
850 * unless they are configured first. Toggle the altsetting to
851 * force a reset.
852 * Some other devices do not work properly with this procedure
853 * that can be avoided using quirk CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE
854 */
855 if (!(ctx->drvflags & CDC_MBIM_FLAG_AVOID_ALTSETTING_TOGGLE))
856 usb_set_interface(dev->udev, iface_no, data_altsetting);
857
858 temp = usb_set_interface(dev->udev, iface_no, 0);
859 if (temp) {
860 dev_dbg(&intf->dev, "set interface failed\n");
861 goto error2;
862 }
863
864 /* initialize basic device settings */
865 if (cdc_ncm_init(dev))
866 goto error2;
867
868 /* Some firmwares need a pause here or they will silently fail
869 * to set up the interface properly. This value was decided
870 * empirically on a Sierra Wireless MC7455 running 02.08.02.00
871 * firmware.
872 */
873 usleep_range(10000, 20000);
874
875 /* configure data interface */
876 temp = usb_set_interface(dev->udev, iface_no, data_altsetting);
877 if (temp) {
878 dev_dbg(&intf->dev, "set interface failed\n");
879 goto error2;
880 }
881
882 /*
883 * Some Huawei devices have been observed to come out of reset in NDP32 mode.
884 * Let's check if this is the case, and set the device to NDP16 mode again if
885 * needed.
886 */
887 if (ctx->drvflags & CDC_NCM_FLAG_RESET_NTB16) {
888 err = usbnet_read_cmd(dev, USB_CDC_GET_NTB_FORMAT,
889 USB_TYPE_CLASS | USB_DIR_IN | USB_RECIP_INTERFACE,
890 0, iface_no, &curr_ntb_format, 2);
891 if (err < 0) {
892 goto error2;
893 }
894
895 if (curr_ntb_format == cpu_to_le16(USB_CDC_NCM_NTB32_FORMAT)) {
896 dev_info(&intf->dev, "resetting NTB format to 16-bit");
897 err = usbnet_write_cmd(dev, USB_CDC_SET_NTB_FORMAT,
898 USB_TYPE_CLASS | USB_DIR_OUT
899 | USB_RECIP_INTERFACE,
900 USB_CDC_NCM_NTB16_FORMAT,
901 iface_no, NULL, 0);
902
903 if (err < 0)
904 goto error2;
905 }
906 }
907
908 cdc_ncm_find_endpoints(dev, ctx->data);
909 cdc_ncm_find_endpoints(dev, ctx->control);
910 if (!dev->in || !dev->out || !dev->status) {
911 dev_dbg(&intf->dev, "failed to collect endpoints\n");
912 goto error2;
913 }
914
915 usb_set_intfdata(ctx->data, dev);
916 usb_set_intfdata(ctx->control, dev);
917
918 if (ctx->ether_desc) {
919 temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress);
920 if (temp) {
921 dev_dbg(&intf->dev, "failed to get mac address\n");
922 goto error2;
923 }
924 dev_info(&intf->dev, "MAC-Address: %pM\n", dev->net->dev_addr);
925 }
926
927 /* finish setting up the device specific data */
928 cdc_ncm_setup(dev);
929
930 /* Allocate the delayed NDP if needed. */
931 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
932 ctx->delayed_ndp16 = kzalloc(ctx->max_ndp_size, GFP_KERNEL);
933 if (!ctx->delayed_ndp16)
934 goto error2;
935 dev_info(&intf->dev, "NDP will be placed at end of frame for this device.");
936 }
937
938 /* override ethtool_ops */
939 dev->net->ethtool_ops = &cdc_ncm_ethtool_ops;
940
941 /* add our sysfs attrs */
942 dev->net->sysfs_groups[0] = &cdc_ncm_sysfs_attr_group;
943
944 /* must handle MTU changes */
945 dev->net->netdev_ops = &cdc_ncm_netdev_ops;
946 dev->net->max_mtu = cdc_ncm_max_dgram_size(dev) - cdc_ncm_eth_hlen(dev);
947
948 return 0;
949
950 error2:
951 usb_set_intfdata(ctx->control, NULL);
952 usb_set_intfdata(ctx->data, NULL);
953 if (ctx->data != ctx->control)
954 usb_driver_release_interface(driver, ctx->data);
955 error:
956 cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]);
957 dev->data[0] = 0;
958 dev_info(&intf->dev, "bind() failure\n");
959 return -ENODEV;
960 }
961 EXPORT_SYMBOL_GPL(cdc_ncm_bind_common);
962
963 void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf)
964 {
965 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
966 struct usb_driver *driver = driver_of(intf);
967
968 if (ctx == NULL)
969 return; /* no setup */
970
971 atomic_set(&ctx->stop, 1);
972
973 hrtimer_cancel(&ctx->tx_timer);
974
975 tasklet_kill(&ctx->bh);
976
977 /* handle devices with combined control and data interface */
978 if (ctx->control == ctx->data)
979 ctx->data = NULL;
980
981 /* disconnect master --> disconnect slave */
982 if (intf == ctx->control && ctx->data) {
983 usb_set_intfdata(ctx->data, NULL);
984 usb_driver_release_interface(driver, ctx->data);
985 ctx->data = NULL;
986
987 } else if (intf == ctx->data && ctx->control) {
988 usb_set_intfdata(ctx->control, NULL);
989 usb_driver_release_interface(driver, ctx->control);
990 ctx->control = NULL;
991 }
992
993 usb_set_intfdata(intf, NULL);
994 cdc_ncm_free(ctx);
995 }
996 EXPORT_SYMBOL_GPL(cdc_ncm_unbind);
997
998 /* Return the number of the MBIM control interface altsetting iff it
999 * is preferred and available,
1000 */
1001 u8 cdc_ncm_select_altsetting(struct usb_interface *intf)
1002 {
1003 struct usb_host_interface *alt;
1004
1005 /* The MBIM spec defines a NCM compatible default altsetting,
1006 * which we may have matched:
1007 *
1008 * "Functions that implement both NCM 1.0 and MBIM (an
1009 * “NCM/MBIM function”) according to this recommendation
1010 * shall provide two alternate settings for the
1011 * Communication Interface. Alternate setting 0, and the
1012 * associated class and endpoint descriptors, shall be
1013 * constructed according to the rules given for the
1014 * Communication Interface in section 5 of [USBNCM10].
1015 * Alternate setting 1, and the associated class and
1016 * endpoint descriptors, shall be constructed according to
1017 * the rules given in section 6 (USB Device Model) of this
1018 * specification."
1019 */
1020 if (intf->num_altsetting < 2)
1021 return intf->cur_altsetting->desc.bAlternateSetting;
1022
1023 if (prefer_mbim) {
1024 alt = usb_altnum_to_altsetting(intf, CDC_NCM_COMM_ALTSETTING_MBIM);
1025 if (alt && cdc_ncm_comm_intf_is_mbim(alt))
1026 return CDC_NCM_COMM_ALTSETTING_MBIM;
1027 }
1028 return CDC_NCM_COMM_ALTSETTING_NCM;
1029 }
1030 EXPORT_SYMBOL_GPL(cdc_ncm_select_altsetting);
1031
1032 static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf)
1033 {
1034 /* MBIM backwards compatible function? */
1035 if (cdc_ncm_select_altsetting(intf) != CDC_NCM_COMM_ALTSETTING_NCM)
1036 return -ENODEV;
1037
1038 /* The NCM data altsetting is fixed, so we hard-coded it.
1039 * Additionally, generic NCM devices are assumed to accept arbitrarily
1040 * placed NDP.
1041 */
1042 return cdc_ncm_bind_common(dev, intf, CDC_NCM_DATA_ALTSETTING_NCM, 0);
1043 }
1044
1045 static void cdc_ncm_align_tail(struct sk_buff *skb, size_t modulus, size_t remainder, size_t max)
1046 {
1047 size_t align = ALIGN(skb->len, modulus) - skb->len + remainder;
1048
1049 if (skb->len + align > max)
1050 align = max - skb->len;
1051 if (align && skb_tailroom(skb) >= align)
1052 skb_put_zero(skb, align);
1053 }
1054
1055 /* return a pointer to a valid struct usb_cdc_ncm_ndp16 of type sign, possibly
1056 * allocating a new one within skb
1057 */
1058 static struct usb_cdc_ncm_ndp16 *cdc_ncm_ndp(struct cdc_ncm_ctx *ctx, struct sk_buff *skb, __le32 sign, size_t reserve)
1059 {
1060 struct usb_cdc_ncm_ndp16 *ndp16 = NULL;
1061 struct usb_cdc_ncm_nth16 *nth16 = (void *)skb->data;
1062 size_t ndpoffset = le16_to_cpu(nth16->wNdpIndex);
1063
1064 /* If NDP should be moved to the end of the NCM package, we can't follow the
1065 * NTH16 header as we would normally do. NDP isn't written to the SKB yet, and
1066 * the wNdpIndex field in the header is actually not consistent with reality. It will be later.
1067 */
1068 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1069 if (ctx->delayed_ndp16->dwSignature == sign)
1070 return ctx->delayed_ndp16;
1071
1072 /* We can only push a single NDP to the end. Return
1073 * NULL to send what we've already got and queue this
1074 * skb for later.
1075 */
1076 else if (ctx->delayed_ndp16->dwSignature)
1077 return NULL;
1078 }
1079
1080 /* follow the chain of NDPs, looking for a match */
1081 while (ndpoffset) {
1082 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb->data + ndpoffset);
1083 if (ndp16->dwSignature == sign)
1084 return ndp16;
1085 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1086 }
1087
1088 /* align new NDP */
1089 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1090 cdc_ncm_align_tail(skb, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size);
1091
1092 /* verify that there is room for the NDP and the datagram (reserve) */
1093 if ((ctx->tx_curr_size - skb->len - reserve) < ctx->max_ndp_size)
1094 return NULL;
1095
1096 /* link to it */
1097 if (ndp16)
1098 ndp16->wNextNdpIndex = cpu_to_le16(skb->len);
1099 else
1100 nth16->wNdpIndex = cpu_to_le16(skb->len);
1101
1102 /* push a new empty NDP */
1103 if (!(ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END))
1104 ndp16 = skb_put_zero(skb, ctx->max_ndp_size);
1105 else
1106 ndp16 = ctx->delayed_ndp16;
1107
1108 ndp16->dwSignature = sign;
1109 ndp16->wLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_ndp16) + sizeof(struct usb_cdc_ncm_dpe16));
1110 return ndp16;
1111 }
1112
1113 struct sk_buff *
1114 cdc_ncm_fill_tx_frame(struct usbnet *dev, struct sk_buff *skb, __le32 sign)
1115 {
1116 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1117 struct usb_cdc_ncm_nth16 *nth16;
1118 struct usb_cdc_ncm_ndp16 *ndp16;
1119 struct sk_buff *skb_out;
1120 u16 n = 0, index, ndplen;
1121 u8 ready2send = 0;
1122 u32 delayed_ndp_size;
1123 size_t padding_count;
1124
1125 /* When our NDP gets written in cdc_ncm_ndp(), then skb_out->len gets updated
1126 * accordingly. Otherwise, we should check here.
1127 */
1128 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END)
1129 delayed_ndp_size = ALIGN(ctx->max_ndp_size, ctx->tx_ndp_modulus);
1130 else
1131 delayed_ndp_size = 0;
1132
1133 /* if there is a remaining skb, it gets priority */
1134 if (skb != NULL) {
1135 swap(skb, ctx->tx_rem_skb);
1136 swap(sign, ctx->tx_rem_sign);
1137 } else {
1138 ready2send = 1;
1139 }
1140
1141 /* check if we are resuming an OUT skb */
1142 skb_out = ctx->tx_curr_skb;
1143
1144 /* allocate a new OUT skb */
1145 if (!skb_out) {
1146 if (ctx->tx_low_mem_val == 0) {
1147 ctx->tx_curr_size = ctx->tx_max;
1148 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1149 /* If the memory allocation fails we will wait longer
1150 * each time before attempting another full size
1151 * allocation again to not overload the system
1152 * further.
1153 */
1154 if (skb_out == NULL) {
1155 ctx->tx_low_mem_max_cnt = min(ctx->tx_low_mem_max_cnt + 1,
1156 (unsigned)CDC_NCM_LOW_MEM_MAX_CNT);
1157 ctx->tx_low_mem_val = ctx->tx_low_mem_max_cnt;
1158 }
1159 }
1160 if (skb_out == NULL) {
1161 /* See if a very small allocation is possible.
1162 * We will send this packet immediately and hope
1163 * that there is more memory available later.
1164 */
1165 if (skb)
1166 ctx->tx_curr_size = max(skb->len,
1167 (u32)USB_CDC_NCM_NTB_MIN_OUT_SIZE);
1168 else
1169 ctx->tx_curr_size = USB_CDC_NCM_NTB_MIN_OUT_SIZE;
1170 skb_out = alloc_skb(ctx->tx_curr_size, GFP_ATOMIC);
1171
1172 /* No allocation possible so we will abort */
1173 if (skb_out == NULL) {
1174 if (skb != NULL) {
1175 dev_kfree_skb_any(skb);
1176 dev->net->stats.tx_dropped++;
1177 }
1178 goto exit_no_skb;
1179 }
1180 ctx->tx_low_mem_val--;
1181 }
1182 /* fill out the initial 16-bit NTB header */
1183 nth16 = skb_put_zero(skb_out, sizeof(struct usb_cdc_ncm_nth16));
1184 nth16->dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN);
1185 nth16->wHeaderLength = cpu_to_le16(sizeof(struct usb_cdc_ncm_nth16));
1186 nth16->wSequence = cpu_to_le16(ctx->tx_seq++);
1187
1188 /* count total number of frames in this NTB */
1189 ctx->tx_curr_frame_num = 0;
1190
1191 /* recent payload counter for this skb_out */
1192 ctx->tx_curr_frame_payload = 0;
1193 }
1194
1195 for (n = ctx->tx_curr_frame_num; n < ctx->tx_max_datagrams; n++) {
1196 /* send any remaining skb first */
1197 if (skb == NULL) {
1198 skb = ctx->tx_rem_skb;
1199 sign = ctx->tx_rem_sign;
1200 ctx->tx_rem_skb = NULL;
1201
1202 /* check for end of skb */
1203 if (skb == NULL)
1204 break;
1205 }
1206
1207 /* get the appropriate NDP for this skb */
1208 ndp16 = cdc_ncm_ndp(ctx, skb_out, sign, skb->len + ctx->tx_modulus + ctx->tx_remainder);
1209
1210 /* align beginning of next frame */
1211 cdc_ncm_align_tail(skb_out, ctx->tx_modulus, ctx->tx_remainder, ctx->tx_curr_size);
1212
1213 /* check if we had enough room left for both NDP and frame */
1214 if (!ndp16 || skb_out->len + skb->len + delayed_ndp_size > ctx->tx_curr_size) {
1215 if (n == 0) {
1216 /* won't fit, MTU problem? */
1217 dev_kfree_skb_any(skb);
1218 skb = NULL;
1219 dev->net->stats.tx_dropped++;
1220 } else {
1221 /* no room for skb - store for later */
1222 if (ctx->tx_rem_skb != NULL) {
1223 dev_kfree_skb_any(ctx->tx_rem_skb);
1224 dev->net->stats.tx_dropped++;
1225 }
1226 ctx->tx_rem_skb = skb;
1227 ctx->tx_rem_sign = sign;
1228 skb = NULL;
1229 ready2send = 1;
1230 ctx->tx_reason_ntb_full++; /* count reason for transmitting */
1231 }
1232 break;
1233 }
1234
1235 /* calculate frame number withing this NDP */
1236 ndplen = le16_to_cpu(ndp16->wLength);
1237 index = (ndplen - sizeof(struct usb_cdc_ncm_ndp16)) / sizeof(struct usb_cdc_ncm_dpe16) - 1;
1238
1239 /* OK, add this skb */
1240 ndp16->dpe16[index].wDatagramLength = cpu_to_le16(skb->len);
1241 ndp16->dpe16[index].wDatagramIndex = cpu_to_le16(skb_out->len);
1242 ndp16->wLength = cpu_to_le16(ndplen + sizeof(struct usb_cdc_ncm_dpe16));
1243 skb_put_data(skb_out, skb->data, skb->len);
1244 ctx->tx_curr_frame_payload += skb->len; /* count real tx payload data */
1245 dev_kfree_skb_any(skb);
1246 skb = NULL;
1247
1248 /* send now if this NDP is full */
1249 if (index >= CDC_NCM_DPT_DATAGRAMS_MAX) {
1250 ready2send = 1;
1251 ctx->tx_reason_ndp_full++; /* count reason for transmitting */
1252 break;
1253 }
1254 }
1255
1256 /* free up any dangling skb */
1257 if (skb != NULL) {
1258 dev_kfree_skb_any(skb);
1259 skb = NULL;
1260 dev->net->stats.tx_dropped++;
1261 }
1262
1263 ctx->tx_curr_frame_num = n;
1264
1265 if (n == 0) {
1266 /* wait for more frames */
1267 /* push variables */
1268 ctx->tx_curr_skb = skb_out;
1269 goto exit_no_skb;
1270
1271 } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0) && (ctx->timer_interval > 0)) {
1272 /* wait for more frames */
1273 /* push variables */
1274 ctx->tx_curr_skb = skb_out;
1275 /* set the pending count */
1276 if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT)
1277 ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT;
1278 goto exit_no_skb;
1279
1280 } else {
1281 if (n == ctx->tx_max_datagrams)
1282 ctx->tx_reason_max_datagram++; /* count reason for transmitting */
1283 /* frame goes out */
1284 /* variables will be reset at next call */
1285 }
1286
1287 /* If requested, put NDP at end of frame. */
1288 if (ctx->drvflags & CDC_NCM_FLAG_NDP_TO_END) {
1289 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1290 cdc_ncm_align_tail(skb_out, ctx->tx_ndp_modulus, 0, ctx->tx_curr_size - ctx->max_ndp_size);
1291 nth16->wNdpIndex = cpu_to_le16(skb_out->len);
1292 skb_put_data(skb_out, ctx->delayed_ndp16, ctx->max_ndp_size);
1293
1294 /* Zero out delayed NDP - signature checking will naturally fail. */
1295 ndp16 = memset(ctx->delayed_ndp16, 0, ctx->max_ndp_size);
1296 }
1297
1298 /* If collected data size is less or equal ctx->min_tx_pkt
1299 * bytes, we send buffers as it is. If we get more data, it
1300 * would be more efficient for USB HS mobile device with DMA
1301 * engine to receive a full size NTB, than canceling DMA
1302 * transfer and receiving a short packet.
1303 *
1304 * This optimization support is pointless if we end up sending
1305 * a ZLP after full sized NTBs.
1306 */
1307 if (!(dev->driver_info->flags & FLAG_SEND_ZLP) &&
1308 skb_out->len > ctx->min_tx_pkt) {
1309 padding_count = ctx->tx_curr_size - skb_out->len;
1310 skb_put_zero(skb_out, padding_count);
1311 } else if (skb_out->len < ctx->tx_curr_size &&
1312 (skb_out->len % dev->maxpacket) == 0) {
1313 skb_put_u8(skb_out, 0); /* force short packet */
1314 }
1315
1316 /* set final frame length */
1317 nth16 = (struct usb_cdc_ncm_nth16 *)skb_out->data;
1318 nth16->wBlockLength = cpu_to_le16(skb_out->len);
1319
1320 /* return skb */
1321 ctx->tx_curr_skb = NULL;
1322
1323 /* keep private stats: framing overhead and number of NTBs */
1324 ctx->tx_overhead += skb_out->len - ctx->tx_curr_frame_payload;
1325 ctx->tx_ntbs++;
1326
1327 /* usbnet will count all the framing overhead by default.
1328 * Adjust the stats so that the tx_bytes counter show real
1329 * payload data instead.
1330 */
1331 usbnet_set_skb_tx_stats(skb_out, n,
1332 (long)ctx->tx_curr_frame_payload - skb_out->len);
1333
1334 return skb_out;
1335
1336 exit_no_skb:
1337 /* Start timer, if there is a remaining non-empty skb */
1338 if (ctx->tx_curr_skb != NULL && n > 0)
1339 cdc_ncm_tx_timeout_start(ctx);
1340 return NULL;
1341 }
1342 EXPORT_SYMBOL_GPL(cdc_ncm_fill_tx_frame);
1343
1344 static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx)
1345 {
1346 /* start timer, if not already started */
1347 if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop)))
1348 hrtimer_start(&ctx->tx_timer,
1349 ctx->timer_interval,
1350 HRTIMER_MODE_REL);
1351 }
1352
1353 static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer)
1354 {
1355 struct cdc_ncm_ctx *ctx =
1356 container_of(timer, struct cdc_ncm_ctx, tx_timer);
1357
1358 if (!atomic_read(&ctx->stop))
1359 tasklet_schedule(&ctx->bh);
1360 return HRTIMER_NORESTART;
1361 }
1362
1363 static void cdc_ncm_txpath_bh(unsigned long param)
1364 {
1365 struct usbnet *dev = (struct usbnet *)param;
1366 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1367
1368 spin_lock_bh(&ctx->mtx);
1369 if (ctx->tx_timer_pending != 0) {
1370 ctx->tx_timer_pending--;
1371 cdc_ncm_tx_timeout_start(ctx);
1372 spin_unlock_bh(&ctx->mtx);
1373 } else if (dev->net != NULL) {
1374 ctx->tx_reason_timeout++; /* count reason for transmitting */
1375 spin_unlock_bh(&ctx->mtx);
1376 netif_tx_lock_bh(dev->net);
1377 usbnet_start_xmit(NULL, dev->net);
1378 netif_tx_unlock_bh(dev->net);
1379 } else {
1380 spin_unlock_bh(&ctx->mtx);
1381 }
1382 }
1383
1384 struct sk_buff *
1385 cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
1386 {
1387 struct sk_buff *skb_out;
1388 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1389
1390 /*
1391 * The Ethernet API we are using does not support transmitting
1392 * multiple Ethernet frames in a single call. This driver will
1393 * accumulate multiple Ethernet frames and send out a larger
1394 * USB frame when the USB buffer is full or when a single jiffies
1395 * timeout happens.
1396 */
1397 if (ctx == NULL)
1398 goto error;
1399
1400 spin_lock_bh(&ctx->mtx);
1401 skb_out = cdc_ncm_fill_tx_frame(dev, skb, cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN));
1402 spin_unlock_bh(&ctx->mtx);
1403 return skb_out;
1404
1405 error:
1406 if (skb != NULL)
1407 dev_kfree_skb_any(skb);
1408
1409 return NULL;
1410 }
1411 EXPORT_SYMBOL_GPL(cdc_ncm_tx_fixup);
1412
1413 /* verify NTB header and return offset of first NDP, or negative error */
1414 int cdc_ncm_rx_verify_nth16(struct cdc_ncm_ctx *ctx, struct sk_buff *skb_in)
1415 {
1416 struct usbnet *dev = netdev_priv(skb_in->dev);
1417 struct usb_cdc_ncm_nth16 *nth16;
1418 int len;
1419 int ret = -EINVAL;
1420
1421 if (ctx == NULL)
1422 goto error;
1423
1424 if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) +
1425 sizeof(struct usb_cdc_ncm_ndp16))) {
1426 netif_dbg(dev, rx_err, dev->net, "frame too short\n");
1427 goto error;
1428 }
1429
1430 nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data;
1431
1432 if (nth16->dwSignature != cpu_to_le32(USB_CDC_NCM_NTH16_SIGN)) {
1433 netif_dbg(dev, rx_err, dev->net,
1434 "invalid NTH16 signature <%#010x>\n",
1435 le32_to_cpu(nth16->dwSignature));
1436 goto error;
1437 }
1438
1439 len = le16_to_cpu(nth16->wBlockLength);
1440 if (len > ctx->rx_max) {
1441 netif_dbg(dev, rx_err, dev->net,
1442 "unsupported NTB block length %u/%u\n", len,
1443 ctx->rx_max);
1444 goto error;
1445 }
1446
1447 if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) &&
1448 (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) &&
1449 !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) {
1450 netif_dbg(dev, rx_err, dev->net,
1451 "sequence number glitch prev=%d curr=%d\n",
1452 ctx->rx_seq, le16_to_cpu(nth16->wSequence));
1453 }
1454 ctx->rx_seq = le16_to_cpu(nth16->wSequence);
1455
1456 ret = le16_to_cpu(nth16->wNdpIndex);
1457 error:
1458 return ret;
1459 }
1460 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_nth16);
1461
1462 /* verify NDP header and return number of datagrams, or negative error */
1463 int cdc_ncm_rx_verify_ndp16(struct sk_buff *skb_in, int ndpoffset)
1464 {
1465 struct usbnet *dev = netdev_priv(skb_in->dev);
1466 struct usb_cdc_ncm_ndp16 *ndp16;
1467 int ret = -EINVAL;
1468
1469 if ((ndpoffset + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) {
1470 netif_dbg(dev, rx_err, dev->net, "invalid NDP offset <%u>\n",
1471 ndpoffset);
1472 goto error;
1473 }
1474 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1475
1476 if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) {
1477 netif_dbg(dev, rx_err, dev->net, "invalid DPT16 length <%u>\n",
1478 le16_to_cpu(ndp16->wLength));
1479 goto error;
1480 }
1481
1482 ret = ((le16_to_cpu(ndp16->wLength) -
1483 sizeof(struct usb_cdc_ncm_ndp16)) /
1484 sizeof(struct usb_cdc_ncm_dpe16));
1485 ret--; /* we process NDP entries except for the last one */
1486
1487 if ((sizeof(struct usb_cdc_ncm_ndp16) +
1488 ret * (sizeof(struct usb_cdc_ncm_dpe16))) > skb_in->len) {
1489 netif_dbg(dev, rx_err, dev->net, "Invalid nframes = %d\n", ret);
1490 ret = -EINVAL;
1491 }
1492
1493 error:
1494 return ret;
1495 }
1496 EXPORT_SYMBOL_GPL(cdc_ncm_rx_verify_ndp16);
1497
1498 int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in)
1499 {
1500 struct sk_buff *skb;
1501 struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0];
1502 int len;
1503 int nframes;
1504 int x;
1505 int offset;
1506 struct usb_cdc_ncm_ndp16 *ndp16;
1507 struct usb_cdc_ncm_dpe16 *dpe16;
1508 int ndpoffset;
1509 int loopcount = 50; /* arbitrary max preventing infinite loop */
1510 u32 payload = 0;
1511
1512 ndpoffset = cdc_ncm_rx_verify_nth16(ctx, skb_in);
1513 if (ndpoffset < 0)
1514 goto error;
1515
1516 next_ndp:
1517 nframes = cdc_ncm_rx_verify_ndp16(skb_in, ndpoffset);
1518 if (nframes < 0)
1519 goto error;
1520
1521 ndp16 = (struct usb_cdc_ncm_ndp16 *)(skb_in->data + ndpoffset);
1522
1523 if (ndp16->dwSignature != cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN)) {
1524 netif_dbg(dev, rx_err, dev->net,
1525 "invalid DPT16 signature <%#010x>\n",
1526 le32_to_cpu(ndp16->dwSignature));
1527 goto err_ndp;
1528 }
1529 dpe16 = ndp16->dpe16;
1530
1531 for (x = 0; x < nframes; x++, dpe16++) {
1532 offset = le16_to_cpu(dpe16->wDatagramIndex);
1533 len = le16_to_cpu(dpe16->wDatagramLength);
1534
1535 /*
1536 * CDC NCM ch. 3.7
1537 * All entries after first NULL entry are to be ignored
1538 */
1539 if ((offset == 0) || (len == 0)) {
1540 if (!x)
1541 goto err_ndp; /* empty NTB */
1542 break;
1543 }
1544
1545 /* sanity checking */
1546 if (((offset + len) > skb_in->len) ||
1547 (len > ctx->rx_max) || (len < ETH_HLEN)) {
1548 netif_dbg(dev, rx_err, dev->net,
1549 "invalid frame detected (ignored) offset[%u]=%u, length=%u, skb=%p\n",
1550 x, offset, len, skb_in);
1551 if (!x)
1552 goto err_ndp;
1553 break;
1554
1555 } else {
1556 /* create a fresh copy to reduce truesize */
1557 skb = netdev_alloc_skb_ip_align(dev->net, len);
1558 if (!skb)
1559 goto error;
1560 skb_put_data(skb, skb_in->data + offset, len);
1561 usbnet_skb_return(dev, skb);
1562 payload += len; /* count payload bytes in this NTB */
1563 }
1564 }
1565 err_ndp:
1566 /* are there more NDPs to process? */
1567 ndpoffset = le16_to_cpu(ndp16->wNextNdpIndex);
1568 if (ndpoffset && loopcount--)
1569 goto next_ndp;
1570
1571 /* update stats */
1572 ctx->rx_overhead += skb_in->len - payload;
1573 ctx->rx_ntbs++;
1574
1575 return 1;
1576 error:
1577 return 0;
1578 }
1579 EXPORT_SYMBOL_GPL(cdc_ncm_rx_fixup);
1580
1581 static void
1582 cdc_ncm_speed_change(struct usbnet *dev,
1583 struct usb_cdc_speed_change *data)
1584 {
1585 uint32_t rx_speed = le32_to_cpu(data->DLBitRRate);
1586 uint32_t tx_speed = le32_to_cpu(data->ULBitRate);
1587
1588 /*
1589 * Currently the USB-NET API does not support reporting the actual
1590 * device speed. Do print it instead.
1591 */
1592 if ((tx_speed > 1000000) && (rx_speed > 1000000)) {
1593 netif_info(dev, link, dev->net,
1594 "%u mbit/s downlink %u mbit/s uplink\n",
1595 (unsigned int)(rx_speed / 1000000U),
1596 (unsigned int)(tx_speed / 1000000U));
1597 } else {
1598 netif_info(dev, link, dev->net,
1599 "%u kbit/s downlink %u kbit/s uplink\n",
1600 (unsigned int)(rx_speed / 1000U),
1601 (unsigned int)(tx_speed / 1000U));
1602 }
1603 }
1604
1605 static void cdc_ncm_status(struct usbnet *dev, struct urb *urb)
1606 {
1607 struct usb_cdc_notification *event;
1608
1609 if (urb->actual_length < sizeof(*event))
1610 return;
1611
1612 /* test for split data in 8-byte chunks */
1613 if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) {
1614 cdc_ncm_speed_change(dev,
1615 (struct usb_cdc_speed_change *)urb->transfer_buffer);
1616 return;
1617 }
1618
1619 event = urb->transfer_buffer;
1620
1621 switch (event->bNotificationType) {
1622 case USB_CDC_NOTIFY_NETWORK_CONNECTION:
1623 /*
1624 * According to the CDC NCM specification ch.7.1
1625 * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be
1626 * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE.
1627 */
1628 netif_info(dev, link, dev->net,
1629 "network connection: %sconnected\n",
1630 !!event->wValue ? "" : "dis");
1631 usbnet_link_change(dev, !!event->wValue, 0);
1632 break;
1633
1634 case USB_CDC_NOTIFY_SPEED_CHANGE:
1635 if (urb->actual_length < (sizeof(*event) +
1636 sizeof(struct usb_cdc_speed_change)))
1637 set_bit(EVENT_STS_SPLIT, &dev->flags);
1638 else
1639 cdc_ncm_speed_change(dev,
1640 (struct usb_cdc_speed_change *)&event[1]);
1641 break;
1642
1643 default:
1644 dev_dbg(&dev->udev->dev,
1645 "NCM: unexpected notification 0x%02x!\n",
1646 event->bNotificationType);
1647 break;
1648 }
1649 }
1650
1651 static const struct driver_info cdc_ncm_info = {
1652 .description = "CDC NCM",
1653 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1654 | FLAG_LINK_INTR,
1655 .bind = cdc_ncm_bind,
1656 .unbind = cdc_ncm_unbind,
1657 .manage_power = usbnet_manage_power,
1658 .status = cdc_ncm_status,
1659 .rx_fixup = cdc_ncm_rx_fixup,
1660 .tx_fixup = cdc_ncm_tx_fixup,
1661 };
1662
1663 /* Same as cdc_ncm_info, but with FLAG_WWAN */
1664 static const struct driver_info wwan_info = {
1665 .description = "Mobile Broadband Network Device",
1666 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1667 | FLAG_LINK_INTR | FLAG_WWAN,
1668 .bind = cdc_ncm_bind,
1669 .unbind = cdc_ncm_unbind,
1670 .manage_power = usbnet_manage_power,
1671 .status = cdc_ncm_status,
1672 .rx_fixup = cdc_ncm_rx_fixup,
1673 .tx_fixup = cdc_ncm_tx_fixup,
1674 };
1675
1676 /* Same as wwan_info, but with FLAG_NOARP */
1677 static const struct driver_info wwan_noarp_info = {
1678 .description = "Mobile Broadband Network Device (NO ARP)",
1679 .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET
1680 | FLAG_LINK_INTR | FLAG_WWAN | FLAG_NOARP,
1681 .bind = cdc_ncm_bind,
1682 .unbind = cdc_ncm_unbind,
1683 .manage_power = usbnet_manage_power,
1684 .status = cdc_ncm_status,
1685 .rx_fixup = cdc_ncm_rx_fixup,
1686 .tx_fixup = cdc_ncm_tx_fixup,
1687 };
1688
1689 static const struct usb_device_id cdc_devs[] = {
1690 /* Ericsson MBM devices like F5521gw */
1691 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1692 | USB_DEVICE_ID_MATCH_VENDOR,
1693 .idVendor = 0x0bdb,
1694 .bInterfaceClass = USB_CLASS_COMM,
1695 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1696 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1697 .driver_info = (unsigned long) &wwan_info,
1698 },
1699
1700 /* Telit LE910 V2 */
1701 { USB_DEVICE_AND_INTERFACE_INFO(0x1bc7, 0x0036,
1702 USB_CLASS_COMM,
1703 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1704 .driver_info = (unsigned long)&wwan_noarp_info,
1705 },
1706
1707 /* DW5812 LTE Verizon Mobile Broadband Card
1708 * Unlike DW5550 this device requires FLAG_NOARP
1709 */
1710 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bb,
1711 USB_CLASS_COMM,
1712 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1713 .driver_info = (unsigned long)&wwan_noarp_info,
1714 },
1715
1716 /* DW5813 LTE AT&T Mobile Broadband Card
1717 * Unlike DW5550 this device requires FLAG_NOARP
1718 */
1719 { USB_DEVICE_AND_INTERFACE_INFO(0x413c, 0x81bc,
1720 USB_CLASS_COMM,
1721 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1722 .driver_info = (unsigned long)&wwan_noarp_info,
1723 },
1724
1725 /* Dell branded MBM devices like DW5550 */
1726 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1727 | USB_DEVICE_ID_MATCH_VENDOR,
1728 .idVendor = 0x413c,
1729 .bInterfaceClass = USB_CLASS_COMM,
1730 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1731 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1732 .driver_info = (unsigned long) &wwan_info,
1733 },
1734
1735 /* Toshiba branded MBM devices */
1736 { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO
1737 | USB_DEVICE_ID_MATCH_VENDOR,
1738 .idVendor = 0x0930,
1739 .bInterfaceClass = USB_CLASS_COMM,
1740 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
1741 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
1742 .driver_info = (unsigned long) &wwan_info,
1743 },
1744
1745 /* tag Huawei devices as wwan */
1746 { USB_VENDOR_AND_INTERFACE_INFO(0x12d1,
1747 USB_CLASS_COMM,
1748 USB_CDC_SUBCLASS_NCM,
1749 USB_CDC_PROTO_NONE),
1750 .driver_info = (unsigned long)&wwan_info,
1751 },
1752
1753 /* Infineon(now Intel) HSPA Modem platform */
1754 { USB_DEVICE_AND_INTERFACE_INFO(0x1519, 0x0443,
1755 USB_CLASS_COMM,
1756 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1757 .driver_info = (unsigned long)&wwan_noarp_info,
1758 },
1759
1760 /* u-blox TOBY-L4 */
1761 { USB_DEVICE_AND_INTERFACE_INFO(0x1546, 0x1010,
1762 USB_CLASS_COMM,
1763 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1764 .driver_info = (unsigned long)&wwan_info,
1765 },
1766
1767 /* Generic CDC-NCM devices */
1768 { USB_INTERFACE_INFO(USB_CLASS_COMM,
1769 USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE),
1770 .driver_info = (unsigned long)&cdc_ncm_info,
1771 },
1772 {
1773 },
1774 };
1775 MODULE_DEVICE_TABLE(usb, cdc_devs);
1776
1777 static struct usb_driver cdc_ncm_driver = {
1778 .name = "cdc_ncm",
1779 .id_table = cdc_devs,
1780 .probe = usbnet_probe,
1781 .disconnect = usbnet_disconnect,
1782 .suspend = usbnet_suspend,
1783 .resume = usbnet_resume,
1784 .reset_resume = usbnet_resume,
1785 .supports_autosuspend = 1,
1786 .disable_hub_initiated_lpm = 1,
1787 };
1788
1789 module_usb_driver(cdc_ncm_driver);
1790
1791 MODULE_AUTHOR("Hans Petter Selasky");
1792 MODULE_DESCRIPTION("USB CDC NCM host driver");
1793 MODULE_LICENSE("Dual BSD/GPL");
Linux with added FPC-III support