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