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900d495a AO |
1 | /* |
2 | * cdc_ncm.c | |
3 | * | |
84e77a8b | 4 | * Copyright (C) ST-Ericsson 2010-2011 |
900d495a AO |
5 | * Contact: Alexey Orishko <alexey.orishko@stericsson.com> |
6 | * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com> | |
7 | * | |
8 | * USB Host Driver for Network Control Model (NCM) | |
9 | * http://www.usb.org/developers/devclass_docs/NCM10.zip | |
10 | * | |
11 | * The NCM encoding, decoding and initialization logic | |
12 | * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h | |
13 | * | |
14 | * This software is available to you under a choice of one of two | |
15 | * licenses. You may choose this file to be licensed under the terms | |
16 | * of the GNU General Public License (GPL) Version 2 or the 2-clause | |
17 | * BSD license listed below: | |
18 | * | |
19 | * Redistribution and use in source and binary forms, with or without | |
20 | * modification, are permitted provided that the following conditions | |
21 | * are met: | |
22 | * 1. Redistributions of source code must retain the above copyright | |
23 | * notice, this list of conditions and the following disclaimer. | |
24 | * 2. Redistributions in binary form must reproduce the above copyright | |
25 | * notice, this list of conditions and the following disclaimer in the | |
26 | * documentation and/or other materials provided with the distribution. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
29 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
30 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
32 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
37 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
38 | * SUCH DAMAGE. | |
39 | */ | |
40 | ||
41 | #include <linux/module.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/netdevice.h> | |
44 | #include <linux/ctype.h> | |
45 | #include <linux/ethtool.h> | |
46 | #include <linux/workqueue.h> | |
47 | #include <linux/mii.h> | |
48 | #include <linux/crc32.h> | |
49 | #include <linux/usb.h> | |
900d495a AO |
50 | #include <linux/timer.h> |
51 | #include <linux/spinlock.h> | |
52 | #include <linux/atomic.h> | |
53 | #include <linux/usb/usbnet.h> | |
54 | #include <linux/usb/cdc.h> | |
55 | ||
36c35416 | 56 | #define DRIVER_VERSION "04-Aug-2011" |
900d495a AO |
57 | |
58 | /* CDC NCM subclass 3.2.1 */ | |
59 | #define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10 | |
60 | ||
61 | /* Maximum NTB length */ | |
6c60408e | 62 | #define CDC_NCM_NTB_MAX_SIZE_TX 16384 /* bytes */ |
900d495a AO |
63 | #define CDC_NCM_NTB_MAX_SIZE_RX 16384 /* bytes */ |
64 | ||
65 | /* Minimum value for MaxDatagramSize, ch. 6.2.9 */ | |
66 | #define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */ | |
67 | ||
68 | #define CDC_NCM_MIN_TX_PKT 512 /* bytes */ | |
69 | ||
70 | /* Default value for MaxDatagramSize */ | |
71 | #define CDC_NCM_MAX_DATAGRAM_SIZE 2048 /* bytes */ | |
72 | ||
73 | /* | |
74 | * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting | |
75 | * the last NULL entry. Any additional datagrams in NTB would be discarded. | |
76 | */ | |
77 | #define CDC_NCM_DPT_DATAGRAMS_MAX 32 | |
78 | ||
84e77a8b AO |
79 | /* Maximum amount of IN datagrams in NTB */ |
80 | #define CDC_NCM_DPT_DATAGRAMS_IN_MAX 0 /* unlimited */ | |
81 | ||
900d495a AO |
82 | /* Restart the timer, if amount of datagrams is less than given value */ |
83 | #define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3 | |
84 | ||
85 | /* The following macro defines the minimum header space */ | |
86 | #define CDC_NCM_MIN_HDR_SIZE \ | |
87 | (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \ | |
88 | (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16)) | |
89 | ||
900d495a AO |
90 | struct cdc_ncm_data { |
91 | struct usb_cdc_ncm_nth16 nth16; | |
92 | struct usb_cdc_ncm_ndp16 ndp16; | |
93 | struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1]; | |
94 | }; | |
95 | ||
96 | struct cdc_ncm_ctx { | |
97 | struct cdc_ncm_data rx_ncm; | |
98 | struct cdc_ncm_data tx_ncm; | |
99 | struct usb_cdc_ncm_ntb_parameters ncm_parm; | |
100 | struct timer_list tx_timer; | |
101 | ||
102 | const struct usb_cdc_ncm_desc *func_desc; | |
103 | const struct usb_cdc_header_desc *header_desc; | |
104 | const struct usb_cdc_union_desc *union_desc; | |
105 | const struct usb_cdc_ether_desc *ether_desc; | |
106 | ||
107 | struct net_device *netdev; | |
108 | struct usb_device *udev; | |
109 | struct usb_host_endpoint *in_ep; | |
110 | struct usb_host_endpoint *out_ep; | |
111 | struct usb_host_endpoint *status_ep; | |
112 | struct usb_interface *intf; | |
113 | struct usb_interface *control; | |
114 | struct usb_interface *data; | |
115 | ||
116 | struct sk_buff *tx_curr_skb; | |
117 | struct sk_buff *tx_rem_skb; | |
118 | ||
119 | spinlock_t mtx; | |
120 | ||
121 | u32 tx_timer_pending; | |
122 | u32 tx_curr_offset; | |
123 | u32 tx_curr_last_offset; | |
124 | u32 tx_curr_frame_num; | |
125 | u32 rx_speed; | |
126 | u32 tx_speed; | |
127 | u32 rx_max; | |
128 | u32 tx_max; | |
129 | u32 max_datagram_size; | |
130 | u16 tx_max_datagrams; | |
131 | u16 tx_remainder; | |
132 | u16 tx_modulus; | |
133 | u16 tx_ndp_modulus; | |
134 | u16 tx_seq; | |
135 | u16 connected; | |
900d495a AO |
136 | }; |
137 | ||
138 | static void cdc_ncm_tx_timeout(unsigned long arg); | |
139 | static const struct driver_info cdc_ncm_info; | |
140 | static struct usb_driver cdc_ncm_driver; | |
141 | static struct ethtool_ops cdc_ncm_ethtool_ops; | |
142 | ||
143 | static const struct usb_device_id cdc_devs[] = { | |
144 | { USB_INTERFACE_INFO(USB_CLASS_COMM, | |
145 | USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), | |
146 | .driver_info = (unsigned long)&cdc_ncm_info, | |
147 | }, | |
148 | { | |
149 | }, | |
150 | }; | |
151 | ||
152 | MODULE_DEVICE_TABLE(usb, cdc_devs); | |
153 | ||
154 | static void | |
155 | cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) | |
156 | { | |
157 | struct usbnet *dev = netdev_priv(net); | |
158 | ||
159 | strncpy(info->driver, dev->driver_name, sizeof(info->driver)); | |
160 | strncpy(info->version, DRIVER_VERSION, sizeof(info->version)); | |
161 | strncpy(info->fw_version, dev->driver_info->description, | |
162 | sizeof(info->fw_version)); | |
163 | usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info)); | |
164 | } | |
165 | ||
900d495a AO |
166 | static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx) |
167 | { | |
900d495a | 168 | u32 val; |
900d495a AO |
169 | u8 flags; |
170 | u8 iface_no; | |
171 | int err; | |
84e77a8b | 172 | u16 ntb_fmt_supported; |
900d495a AO |
173 | |
174 | iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; | |
175 | ||
36c35416 GS |
176 | err = usb_control_msg(ctx->udev, |
177 | usb_rcvctrlpipe(ctx->udev, 0), | |
178 | USB_CDC_GET_NTB_PARAMETERS, | |
179 | USB_TYPE_CLASS | USB_DIR_IN | |
180 | | USB_RECIP_INTERFACE, | |
181 | 0, iface_no, &ctx->ncm_parm, | |
182 | sizeof(ctx->ncm_parm), 10000); | |
183 | if (err < 0) { | |
900d495a AO |
184 | pr_debug("failed GET_NTB_PARAMETERS\n"); |
185 | return 1; | |
186 | } | |
187 | ||
188 | /* read correct set of parameters according to device mode */ | |
189 | ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); | |
190 | ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); | |
191 | ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); | |
192 | ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); | |
193 | ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); | |
84e77a8b AO |
194 | /* devices prior to NCM Errata shall set this field to zero */ |
195 | ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); | |
196 | ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported); | |
900d495a AO |
197 | |
198 | if (ctx->func_desc != NULL) | |
199 | flags = ctx->func_desc->bmNetworkCapabilities; | |
200 | else | |
201 | flags = 0; | |
202 | ||
203 | pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u " | |
204 | "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u " | |
84e77a8b | 205 | "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", |
900d495a | 206 | ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, |
84e77a8b | 207 | ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags); |
900d495a | 208 | |
84e77a8b AO |
209 | /* max count of tx datagrams */ |
210 | if ((ctx->tx_max_datagrams == 0) || | |
211 | (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) | |
212 | ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; | |
900d495a AO |
213 | |
214 | /* verify maximum size of received NTB in bytes */ | |
84e77a8b AO |
215 | if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) { |
216 | pr_debug("Using min receive length=%d\n", | |
217 | USB_CDC_NCM_NTB_MIN_IN_SIZE); | |
218 | ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE; | |
219 | } | |
220 | ||
221 | if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) { | |
900d495a AO |
222 | pr_debug("Using default maximum receive length=%d\n", |
223 | CDC_NCM_NTB_MAX_SIZE_RX); | |
224 | ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX; | |
225 | } | |
226 | ||
84e77a8b AO |
227 | /* inform device about NTB input size changes */ |
228 | if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) { | |
84e77a8b AO |
229 | |
230 | if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) { | |
75bc8ef5 JB |
231 | struct usb_cdc_ncm_ndp_input_size *ndp_in_sz; |
232 | ||
233 | ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL); | |
234 | if (!ndp_in_sz) { | |
235 | err = -ENOMEM; | |
236 | goto size_err; | |
237 | } | |
238 | ||
36c35416 GS |
239 | err = usb_control_msg(ctx->udev, |
240 | usb_sndctrlpipe(ctx->udev, 0), | |
241 | USB_CDC_SET_NTB_INPUT_SIZE, | |
242 | USB_TYPE_CLASS | USB_DIR_OUT | |
243 | | USB_RECIP_INTERFACE, | |
75bc8ef5 JB |
244 | 0, iface_no, ndp_in_sz, 8, 1000); |
245 | kfree(ndp_in_sz); | |
84e77a8b | 246 | } else { |
75bc8ef5 JB |
247 | __le32 *dwNtbInMaxSize; |
248 | dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize), | |
249 | GFP_KERNEL); | |
250 | if (!dwNtbInMaxSize) { | |
251 | err = -ENOMEM; | |
252 | goto size_err; | |
253 | } | |
254 | *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max); | |
255 | ||
36c35416 GS |
256 | err = usb_control_msg(ctx->udev, |
257 | usb_sndctrlpipe(ctx->udev, 0), | |
258 | USB_CDC_SET_NTB_INPUT_SIZE, | |
259 | USB_TYPE_CLASS | USB_DIR_OUT | |
260 | | USB_RECIP_INTERFACE, | |
75bc8ef5 JB |
261 | 0, iface_no, dwNtbInMaxSize, 4, 1000); |
262 | kfree(dwNtbInMaxSize); | |
84e77a8b | 263 | } |
75bc8ef5 | 264 | size_err: |
36c35416 | 265 | if (err < 0) |
84e77a8b AO |
266 | pr_debug("Setting NTB Input Size failed\n"); |
267 | } | |
268 | ||
900d495a AO |
269 | /* verify maximum size of transmitted NTB in bytes */ |
270 | if ((ctx->tx_max < | |
271 | (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) || | |
272 | (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) { | |
273 | pr_debug("Using default maximum transmit length=%d\n", | |
274 | CDC_NCM_NTB_MAX_SIZE_TX); | |
275 | ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX; | |
276 | } | |
277 | ||
278 | /* | |
279 | * verify that the structure alignment is: | |
280 | * - power of two | |
281 | * - not greater than the maximum transmit length | |
282 | * - not less than four bytes | |
283 | */ | |
284 | val = ctx->tx_ndp_modulus; | |
285 | ||
286 | if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || | |
287 | (val != ((-val) & val)) || (val >= ctx->tx_max)) { | |
288 | pr_debug("Using default alignment: 4 bytes\n"); | |
289 | ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; | |
290 | } | |
291 | ||
292 | /* | |
293 | * verify that the payload alignment is: | |
294 | * - power of two | |
295 | * - not greater than the maximum transmit length | |
296 | * - not less than four bytes | |
297 | */ | |
298 | val = ctx->tx_modulus; | |
299 | ||
300 | if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || | |
301 | (val != ((-val) & val)) || (val >= ctx->tx_max)) { | |
302 | pr_debug("Using default transmit modulus: 4 bytes\n"); | |
303 | ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; | |
304 | } | |
305 | ||
306 | /* verify the payload remainder */ | |
307 | if (ctx->tx_remainder >= ctx->tx_modulus) { | |
308 | pr_debug("Using default transmit remainder: 0 bytes\n"); | |
309 | ctx->tx_remainder = 0; | |
310 | } | |
311 | ||
312 | /* adjust TX-remainder according to NCM specification. */ | |
313 | ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) & | |
314 | (ctx->tx_modulus - 1)); | |
315 | ||
316 | /* additional configuration */ | |
317 | ||
318 | /* set CRC Mode */ | |
84e77a8b | 319 | if (flags & USB_CDC_NCM_NCAP_CRC_MODE) { |
36c35416 GS |
320 | err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), |
321 | USB_CDC_SET_CRC_MODE, | |
322 | USB_TYPE_CLASS | USB_DIR_OUT | |
323 | | USB_RECIP_INTERFACE, | |
324 | USB_CDC_NCM_CRC_NOT_APPENDED, | |
325 | iface_no, NULL, 0, 1000); | |
326 | if (err < 0) | |
84e77a8b AO |
327 | pr_debug("Setting CRC mode off failed\n"); |
328 | } | |
900d495a | 329 | |
84e77a8b AO |
330 | /* set NTB format, if both formats are supported */ |
331 | if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) { | |
36c35416 GS |
332 | err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), |
333 | USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS | |
334 | | USB_DIR_OUT | USB_RECIP_INTERFACE, | |
335 | USB_CDC_NCM_NTB16_FORMAT, | |
336 | iface_no, NULL, 0, 1000); | |
337 | if (err < 0) | |
84e77a8b AO |
338 | pr_debug("Setting NTB format to 16-bit failed\n"); |
339 | } | |
900d495a | 340 | |
84e77a8b | 341 | ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE; |
900d495a AO |
342 | |
343 | /* set Max Datagram Size (MTU) */ | |
84e77a8b | 344 | if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) { |
75bc8ef5 | 345 | __le16 *max_datagram_size; |
84e77a8b | 346 | u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); |
75bc8ef5 JB |
347 | |
348 | max_datagram_size = kzalloc(sizeof(*max_datagram_size), | |
349 | GFP_KERNEL); | |
350 | if (!max_datagram_size) { | |
351 | err = -ENOMEM; | |
352 | goto max_dgram_err; | |
353 | } | |
354 | ||
36c35416 GS |
355 | err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0), |
356 | USB_CDC_GET_MAX_DATAGRAM_SIZE, | |
357 | USB_TYPE_CLASS | USB_DIR_IN | |
358 | | USB_RECIP_INTERFACE, | |
75bc8ef5 | 359 | 0, iface_no, max_datagram_size, |
36c35416 GS |
360 | 2, 1000); |
361 | if (err < 0) { | |
84e77a8b AO |
362 | pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n", |
363 | CDC_NCM_MIN_DATAGRAM_SIZE); | |
75bc8ef5 | 364 | kfree(max_datagram_size); |
84e77a8b | 365 | } else { |
75bc8ef5 JB |
366 | ctx->max_datagram_size = |
367 | le16_to_cpu(*max_datagram_size); | |
84e77a8b AO |
368 | /* Check Eth descriptor value */ |
369 | if (eth_max_sz < CDC_NCM_MAX_DATAGRAM_SIZE) { | |
370 | if (ctx->max_datagram_size > eth_max_sz) | |
371 | ctx->max_datagram_size = eth_max_sz; | |
372 | } else { | |
373 | if (ctx->max_datagram_size > | |
374 | CDC_NCM_MAX_DATAGRAM_SIZE) | |
375 | ctx->max_datagram_size = | |
376 | CDC_NCM_MAX_DATAGRAM_SIZE; | |
377 | } | |
900d495a | 378 | |
84e77a8b AO |
379 | if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE) |
380 | ctx->max_datagram_size = | |
381 | CDC_NCM_MIN_DATAGRAM_SIZE; | |
382 | ||
383 | /* if value changed, update device */ | |
36c35416 GS |
384 | err = usb_control_msg(ctx->udev, |
385 | usb_sndctrlpipe(ctx->udev, 0), | |
386 | USB_CDC_SET_MAX_DATAGRAM_SIZE, | |
387 | USB_TYPE_CLASS | USB_DIR_OUT | |
388 | | USB_RECIP_INTERFACE, | |
389 | 0, | |
75bc8ef5 | 390 | iface_no, max_datagram_size, |
36c35416 | 391 | 2, 1000); |
75bc8ef5 JB |
392 | kfree(max_datagram_size); |
393 | max_dgram_err: | |
36c35416 | 394 | if (err < 0) |
84e77a8b AO |
395 | pr_debug("SET_MAX_DATAGRAM_SIZE failed\n"); |
396 | } | |
900d495a | 397 | |
900d495a AO |
398 | } |
399 | ||
400 | if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN)) | |
401 | ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
406 | static void | |
407 | cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf) | |
408 | { | |
409 | struct usb_host_endpoint *e; | |
410 | u8 ep; | |
411 | ||
412 | for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) { | |
413 | ||
414 | e = intf->cur_altsetting->endpoint + ep; | |
415 | switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { | |
416 | case USB_ENDPOINT_XFER_INT: | |
417 | if (usb_endpoint_dir_in(&e->desc)) { | |
418 | if (ctx->status_ep == NULL) | |
419 | ctx->status_ep = e; | |
420 | } | |
421 | break; | |
422 | ||
423 | case USB_ENDPOINT_XFER_BULK: | |
424 | if (usb_endpoint_dir_in(&e->desc)) { | |
425 | if (ctx->in_ep == NULL) | |
426 | ctx->in_ep = e; | |
427 | } else { | |
428 | if (ctx->out_ep == NULL) | |
429 | ctx->out_ep = e; | |
430 | } | |
431 | break; | |
432 | ||
433 | default: | |
434 | break; | |
435 | } | |
436 | } | |
437 | } | |
438 | ||
439 | static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) | |
440 | { | |
441 | if (ctx == NULL) | |
442 | return; | |
443 | ||
444 | del_timer_sync(&ctx->tx_timer); | |
445 | ||
900d495a AO |
446 | if (ctx->tx_rem_skb != NULL) { |
447 | dev_kfree_skb_any(ctx->tx_rem_skb); | |
448 | ctx->tx_rem_skb = NULL; | |
449 | } | |
450 | ||
451 | if (ctx->tx_curr_skb != NULL) { | |
452 | dev_kfree_skb_any(ctx->tx_curr_skb); | |
453 | ctx->tx_curr_skb = NULL; | |
454 | } | |
455 | ||
456 | kfree(ctx); | |
457 | } | |
458 | ||
459 | static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) | |
460 | { | |
461 | struct cdc_ncm_ctx *ctx; | |
462 | struct usb_driver *driver; | |
463 | u8 *buf; | |
464 | int len; | |
465 | int temp; | |
466 | u8 iface_no; | |
467 | ||
468 | ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); | |
469 | if (ctx == NULL) | |
19694ac8 | 470 | return -ENODEV; |
900d495a AO |
471 | |
472 | memset(ctx, 0, sizeof(*ctx)); | |
473 | ||
474 | init_timer(&ctx->tx_timer); | |
475 | spin_lock_init(&ctx->mtx); | |
476 | ctx->netdev = dev->net; | |
477 | ||
478 | /* store ctx pointer in device data field */ | |
479 | dev->data[0] = (unsigned long)ctx; | |
480 | ||
481 | /* get some pointers */ | |
482 | driver = driver_of(intf); | |
483 | buf = intf->cur_altsetting->extra; | |
484 | len = intf->cur_altsetting->extralen; | |
485 | ||
486 | ctx->udev = dev->udev; | |
487 | ctx->intf = intf; | |
488 | ||
489 | /* parse through descriptors associated with control interface */ | |
490 | while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) { | |
491 | ||
492 | if (buf[1] != USB_DT_CS_INTERFACE) | |
493 | goto advance; | |
494 | ||
495 | switch (buf[2]) { | |
496 | case USB_CDC_UNION_TYPE: | |
497 | if (buf[0] < sizeof(*(ctx->union_desc))) | |
498 | break; | |
499 | ||
500 | ctx->union_desc = | |
501 | (const struct usb_cdc_union_desc *)buf; | |
502 | ||
503 | ctx->control = usb_ifnum_to_if(dev->udev, | |
504 | ctx->union_desc->bMasterInterface0); | |
505 | ctx->data = usb_ifnum_to_if(dev->udev, | |
506 | ctx->union_desc->bSlaveInterface0); | |
507 | break; | |
508 | ||
509 | case USB_CDC_ETHERNET_TYPE: | |
510 | if (buf[0] < sizeof(*(ctx->ether_desc))) | |
511 | break; | |
512 | ||
513 | ctx->ether_desc = | |
514 | (const struct usb_cdc_ether_desc *)buf; | |
900d495a AO |
515 | dev->hard_mtu = |
516 | le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); | |
517 | ||
84e77a8b AO |
518 | if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE) |
519 | dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE; | |
520 | else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE) | |
521 | dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE; | |
900d495a AO |
522 | break; |
523 | ||
524 | case USB_CDC_NCM_TYPE: | |
525 | if (buf[0] < sizeof(*(ctx->func_desc))) | |
526 | break; | |
527 | ||
528 | ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf; | |
529 | break; | |
530 | ||
531 | default: | |
532 | break; | |
533 | } | |
534 | advance: | |
535 | /* advance to next descriptor */ | |
536 | temp = buf[0]; | |
537 | buf += temp; | |
538 | len -= temp; | |
539 | } | |
540 | ||
541 | /* check if we got everything */ | |
542 | if ((ctx->control == NULL) || (ctx->data == NULL) || | |
19694ac8 | 543 | (ctx->ether_desc == NULL) || (ctx->control != intf)) |
900d495a AO |
544 | goto error; |
545 | ||
546 | /* claim interfaces, if any */ | |
19694ac8 AO |
547 | temp = usb_driver_claim_interface(driver, ctx->data, dev); |
548 | if (temp) | |
549 | goto error; | |
900d495a AO |
550 | |
551 | iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; | |
552 | ||
553 | /* reset data interface */ | |
554 | temp = usb_set_interface(dev->udev, iface_no, 0); | |
555 | if (temp) | |
19694ac8 | 556 | goto error2; |
900d495a AO |
557 | |
558 | /* initialize data interface */ | |
559 | if (cdc_ncm_setup(ctx)) | |
19694ac8 | 560 | goto error2; |
900d495a AO |
561 | |
562 | /* configure data interface */ | |
563 | temp = usb_set_interface(dev->udev, iface_no, 1); | |
564 | if (temp) | |
19694ac8 | 565 | goto error2; |
900d495a AO |
566 | |
567 | cdc_ncm_find_endpoints(ctx, ctx->data); | |
568 | cdc_ncm_find_endpoints(ctx, ctx->control); | |
569 | ||
570 | if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) || | |
571 | (ctx->status_ep == NULL)) | |
19694ac8 | 572 | goto error2; |
900d495a AO |
573 | |
574 | dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; | |
575 | ||
576 | usb_set_intfdata(ctx->data, dev); | |
577 | usb_set_intfdata(ctx->control, dev); | |
578 | usb_set_intfdata(ctx->intf, dev); | |
579 | ||
580 | temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); | |
581 | if (temp) | |
19694ac8 | 582 | goto error2; |
900d495a AO |
583 | |
584 | dev_info(&dev->udev->dev, "MAC-Address: " | |
585 | "0x%02x:0x%02x:0x%02x:0x%02x:0x%02x:0x%02x\n", | |
586 | dev->net->dev_addr[0], dev->net->dev_addr[1], | |
587 | dev->net->dev_addr[2], dev->net->dev_addr[3], | |
588 | dev->net->dev_addr[4], dev->net->dev_addr[5]); | |
589 | ||
590 | dev->in = usb_rcvbulkpipe(dev->udev, | |
591 | ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
592 | dev->out = usb_sndbulkpipe(dev->udev, | |
593 | ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
594 | dev->status = ctx->status_ep; | |
595 | dev->rx_urb_size = ctx->rx_max; | |
596 | ||
597 | /* | |
598 | * We should get an event when network connection is "connected" or | |
599 | * "disconnected". Set network connection in "disconnected" state | |
600 | * (carrier is OFF) during attach, so the IP network stack does not | |
601 | * start IPv6 negotiation and more. | |
602 | */ | |
603 | netif_carrier_off(dev->net); | |
604 | ctx->tx_speed = ctx->rx_speed = 0; | |
605 | return 0; | |
606 | ||
19694ac8 AO |
607 | error2: |
608 | usb_set_intfdata(ctx->control, NULL); | |
609 | usb_set_intfdata(ctx->data, NULL); | |
610 | usb_driver_release_interface(driver, ctx->data); | |
900d495a AO |
611 | error: |
612 | cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); | |
613 | dev->data[0] = 0; | |
19694ac8 | 614 | dev_info(&dev->udev->dev, "bind() failure\n"); |
900d495a AO |
615 | return -ENODEV; |
616 | } | |
617 | ||
618 | static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) | |
619 | { | |
620 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
19694ac8 | 621 | struct usb_driver *driver = driver_of(intf); |
900d495a AO |
622 | |
623 | if (ctx == NULL) | |
624 | return; /* no setup */ | |
625 | ||
19694ac8 AO |
626 | /* disconnect master --> disconnect slave */ |
627 | if (intf == ctx->control && ctx->data) { | |
628 | usb_set_intfdata(ctx->data, NULL); | |
900d495a | 629 | usb_driver_release_interface(driver, ctx->data); |
19694ac8 | 630 | ctx->data = NULL; |
900d495a | 631 | |
19694ac8 AO |
632 | } else if (intf == ctx->data && ctx->control) { |
633 | usb_set_intfdata(ctx->control, NULL); | |
900d495a | 634 | usb_driver_release_interface(driver, ctx->control); |
19694ac8 | 635 | ctx->control = NULL; |
900d495a AO |
636 | } |
637 | ||
19694ac8 | 638 | usb_set_intfdata(ctx->intf, NULL); |
900d495a AO |
639 | cdc_ncm_free(ctx); |
640 | } | |
641 | ||
642 | static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max) | |
643 | { | |
644 | if (first >= max) | |
645 | return; | |
646 | if (first >= end) | |
647 | return; | |
648 | if (end > max) | |
649 | end = max; | |
650 | memset(ptr + first, 0, end - first); | |
651 | } | |
652 | ||
653 | static struct sk_buff * | |
654 | cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb) | |
655 | { | |
656 | struct sk_buff *skb_out; | |
657 | u32 rem; | |
658 | u32 offset; | |
659 | u32 last_offset; | |
36c35416 | 660 | u16 n = 0, index; |
84e77a8b | 661 | u8 ready2send = 0; |
900d495a AO |
662 | |
663 | /* if there is a remaining skb, it gets priority */ | |
664 | if (skb != NULL) | |
665 | swap(skb, ctx->tx_rem_skb); | |
666 | else | |
84e77a8b | 667 | ready2send = 1; |
900d495a AO |
668 | |
669 | /* | |
670 | * +----------------+ | |
671 | * | skb_out | | |
672 | * +----------------+ | |
673 | * ^ offset | |
674 | * ^ last_offset | |
675 | */ | |
676 | ||
677 | /* check if we are resuming an OUT skb */ | |
678 | if (ctx->tx_curr_skb != NULL) { | |
679 | /* pop variables */ | |
680 | skb_out = ctx->tx_curr_skb; | |
681 | offset = ctx->tx_curr_offset; | |
682 | last_offset = ctx->tx_curr_last_offset; | |
683 | n = ctx->tx_curr_frame_num; | |
684 | ||
685 | } else { | |
686 | /* reset variables */ | |
6c60408e | 687 | skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC); |
900d495a AO |
688 | if (skb_out == NULL) { |
689 | if (skb != NULL) { | |
690 | dev_kfree_skb_any(skb); | |
691 | ctx->netdev->stats.tx_dropped++; | |
692 | } | |
693 | goto exit_no_skb; | |
694 | } | |
695 | ||
696 | /* make room for NTH and NDP */ | |
697 | offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16), | |
698 | ctx->tx_ndp_modulus) + | |
699 | sizeof(struct usb_cdc_ncm_ndp16) + | |
700 | (ctx->tx_max_datagrams + 1) * | |
701 | sizeof(struct usb_cdc_ncm_dpe16); | |
702 | ||
703 | /* store last valid offset before alignment */ | |
704 | last_offset = offset; | |
705 | /* align first Datagram offset correctly */ | |
706 | offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder; | |
707 | /* zero buffer till the first IP datagram */ | |
708 | cdc_ncm_zero_fill(skb_out->data, 0, offset, offset); | |
709 | n = 0; | |
710 | ctx->tx_curr_frame_num = 0; | |
711 | } | |
712 | ||
713 | for (; n < ctx->tx_max_datagrams; n++) { | |
714 | /* check if end of transmit buffer is reached */ | |
84e77a8b AO |
715 | if (offset >= ctx->tx_max) { |
716 | ready2send = 1; | |
900d495a | 717 | break; |
84e77a8b | 718 | } |
900d495a AO |
719 | /* compute maximum buffer size */ |
720 | rem = ctx->tx_max - offset; | |
721 | ||
722 | if (skb == NULL) { | |
723 | skb = ctx->tx_rem_skb; | |
724 | ctx->tx_rem_skb = NULL; | |
725 | ||
726 | /* check for end of skb */ | |
727 | if (skb == NULL) | |
728 | break; | |
729 | } | |
730 | ||
731 | if (skb->len > rem) { | |
732 | if (n == 0) { | |
733 | /* won't fit, MTU problem? */ | |
734 | dev_kfree_skb_any(skb); | |
735 | skb = NULL; | |
736 | ctx->netdev->stats.tx_dropped++; | |
737 | } else { | |
738 | /* no room for skb - store for later */ | |
739 | if (ctx->tx_rem_skb != NULL) { | |
740 | dev_kfree_skb_any(ctx->tx_rem_skb); | |
741 | ctx->netdev->stats.tx_dropped++; | |
742 | } | |
743 | ctx->tx_rem_skb = skb; | |
744 | skb = NULL; | |
84e77a8b | 745 | ready2send = 1; |
900d495a AO |
746 | } |
747 | break; | |
748 | } | |
749 | ||
750 | memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len); | |
751 | ||
752 | ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len); | |
753 | ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset); | |
754 | ||
755 | /* update offset */ | |
756 | offset += skb->len; | |
757 | ||
758 | /* store last valid offset before alignment */ | |
759 | last_offset = offset; | |
760 | ||
761 | /* align offset correctly */ | |
762 | offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder; | |
763 | ||
764 | /* zero padding */ | |
765 | cdc_ncm_zero_fill(skb_out->data, last_offset, offset, | |
766 | ctx->tx_max); | |
767 | dev_kfree_skb_any(skb); | |
768 | skb = NULL; | |
769 | } | |
770 | ||
771 | /* free up any dangling skb */ | |
772 | if (skb != NULL) { | |
773 | dev_kfree_skb_any(skb); | |
774 | skb = NULL; | |
775 | ctx->netdev->stats.tx_dropped++; | |
776 | } | |
777 | ||
778 | ctx->tx_curr_frame_num = n; | |
779 | ||
780 | if (n == 0) { | |
781 | /* wait for more frames */ | |
782 | /* push variables */ | |
783 | ctx->tx_curr_skb = skb_out; | |
784 | ctx->tx_curr_offset = offset; | |
785 | ctx->tx_curr_last_offset = last_offset; | |
786 | goto exit_no_skb; | |
787 | ||
84e77a8b | 788 | } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) { |
900d495a AO |
789 | /* wait for more frames */ |
790 | /* push variables */ | |
791 | ctx->tx_curr_skb = skb_out; | |
792 | ctx->tx_curr_offset = offset; | |
793 | ctx->tx_curr_last_offset = last_offset; | |
794 | /* set the pending count */ | |
795 | if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) | |
796 | ctx->tx_timer_pending = 2; | |
797 | goto exit_no_skb; | |
798 | ||
799 | } else { | |
800 | /* frame goes out */ | |
801 | /* variables will be reset at next call */ | |
802 | } | |
803 | ||
804 | /* check for overflow */ | |
805 | if (last_offset > ctx->tx_max) | |
806 | last_offset = ctx->tx_max; | |
807 | ||
808 | /* revert offset */ | |
809 | offset = last_offset; | |
810 | ||
811 | /* | |
812 | * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes, | |
813 | * we send buffers as it is. If we get more data, it would be more | |
814 | * efficient for USB HS mobile device with DMA engine to receive a full | |
815 | * size NTB, than canceling DMA transfer and receiving a short packet. | |
816 | */ | |
817 | if (offset > CDC_NCM_MIN_TX_PKT) | |
818 | offset = ctx->tx_max; | |
819 | ||
820 | /* final zero padding */ | |
821 | cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max); | |
822 | ||
823 | /* store last offset */ | |
824 | last_offset = offset; | |
825 | ||
6c60408e AO |
826 | if (((last_offset < ctx->tx_max) && ((last_offset % |
827 | le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) || | |
828 | (((last_offset == ctx->tx_max) && ((ctx->tx_max % | |
829 | le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) && | |
830 | (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) { | |
900d495a AO |
831 | /* force short packet */ |
832 | *(((u8 *)skb_out->data) + last_offset) = 0; | |
833 | last_offset++; | |
834 | } | |
835 | ||
836 | /* zero the rest of the DPEs plus the last NULL entry */ | |
837 | for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) { | |
838 | ctx->tx_ncm.dpe16[n].wDatagramLength = 0; | |
839 | ctx->tx_ncm.dpe16[n].wDatagramIndex = 0; | |
840 | } | |
841 | ||
842 | /* fill out 16-bit NTB header */ | |
843 | ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); | |
844 | ctx->tx_ncm.nth16.wHeaderLength = | |
845 | cpu_to_le16(sizeof(ctx->tx_ncm.nth16)); | |
846 | ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq); | |
847 | ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset); | |
36c35416 GS |
848 | index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus); |
849 | ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index); | |
900d495a AO |
850 | |
851 | memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16)); | |
852 | ctx->tx_seq++; | |
853 | ||
854 | /* fill out 16-bit NDP table */ | |
855 | ctx->tx_ncm.ndp16.dwSignature = | |
856 | cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN); | |
857 | rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) * | |
858 | sizeof(struct usb_cdc_ncm_dpe16)); | |
859 | ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem); | |
84e77a8b | 860 | ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */ |
900d495a | 861 | |
36c35416 | 862 | memcpy(((u8 *)skb_out->data) + index, |
900d495a AO |
863 | &(ctx->tx_ncm.ndp16), |
864 | sizeof(ctx->tx_ncm.ndp16)); | |
865 | ||
36c35416 | 866 | memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16), |
900d495a AO |
867 | &(ctx->tx_ncm.dpe16), |
868 | (ctx->tx_curr_frame_num + 1) * | |
869 | sizeof(struct usb_cdc_ncm_dpe16)); | |
870 | ||
871 | /* set frame length */ | |
872 | skb_put(skb_out, last_offset); | |
873 | ||
874 | /* return skb */ | |
875 | ctx->tx_curr_skb = NULL; | |
876 | return skb_out; | |
877 | ||
878 | exit_no_skb: | |
879 | return NULL; | |
880 | } | |
881 | ||
882 | static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) | |
883 | { | |
884 | /* start timer, if not already started */ | |
885 | if (timer_pending(&ctx->tx_timer) == 0) { | |
886 | ctx->tx_timer.function = &cdc_ncm_tx_timeout; | |
887 | ctx->tx_timer.data = (unsigned long)ctx; | |
888 | ctx->tx_timer.expires = jiffies + ((HZ + 999) / 1000); | |
889 | add_timer(&ctx->tx_timer); | |
890 | } | |
891 | } | |
892 | ||
893 | static void cdc_ncm_tx_timeout(unsigned long arg) | |
894 | { | |
895 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)arg; | |
896 | u8 restart; | |
897 | ||
898 | spin_lock(&ctx->mtx); | |
899 | if (ctx->tx_timer_pending != 0) { | |
900 | ctx->tx_timer_pending--; | |
901 | restart = 1; | |
f742aa8a | 902 | } else { |
900d495a | 903 | restart = 0; |
f742aa8a | 904 | } |
900d495a AO |
905 | |
906 | spin_unlock(&ctx->mtx); | |
907 | ||
f742aa8a AO |
908 | if (restart) { |
909 | spin_lock(&ctx->mtx); | |
900d495a | 910 | cdc_ncm_tx_timeout_start(ctx); |
f742aa8a AO |
911 | spin_unlock(&ctx->mtx); |
912 | } else if (ctx->netdev != NULL) { | |
900d495a | 913 | usbnet_start_xmit(NULL, ctx->netdev); |
f742aa8a | 914 | } |
900d495a AO |
915 | } |
916 | ||
917 | static struct sk_buff * | |
918 | cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) | |
919 | { | |
920 | struct sk_buff *skb_out; | |
921 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
922 | u8 need_timer = 0; | |
923 | ||
924 | /* | |
925 | * The Ethernet API we are using does not support transmitting | |
926 | * multiple Ethernet frames in a single call. This driver will | |
927 | * accumulate multiple Ethernet frames and send out a larger | |
928 | * USB frame when the USB buffer is full or when a single jiffies | |
929 | * timeout happens. | |
930 | */ | |
931 | if (ctx == NULL) | |
932 | goto error; | |
933 | ||
934 | spin_lock(&ctx->mtx); | |
935 | skb_out = cdc_ncm_fill_tx_frame(ctx, skb); | |
936 | if (ctx->tx_curr_skb != NULL) | |
937 | need_timer = 1; | |
900d495a AO |
938 | |
939 | /* Start timer, if there is a remaining skb */ | |
940 | if (need_timer) | |
941 | cdc_ncm_tx_timeout_start(ctx); | |
942 | ||
943 | if (skb_out) | |
944 | dev->net->stats.tx_packets += ctx->tx_curr_frame_num; | |
f742aa8a AO |
945 | |
946 | spin_unlock(&ctx->mtx); | |
900d495a AO |
947 | return skb_out; |
948 | ||
949 | error: | |
950 | if (skb != NULL) | |
951 | dev_kfree_skb_any(skb); | |
952 | ||
953 | return NULL; | |
954 | } | |
955 | ||
956 | static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) | |
957 | { | |
958 | struct sk_buff *skb; | |
959 | struct cdc_ncm_ctx *ctx; | |
960 | int sumlen; | |
961 | int actlen; | |
962 | int temp; | |
963 | int nframes; | |
964 | int x; | |
965 | int offset; | |
966 | ||
967 | ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
968 | if (ctx == NULL) | |
969 | goto error; | |
970 | ||
971 | actlen = skb_in->len; | |
972 | sumlen = CDC_NCM_NTB_MAX_SIZE_RX; | |
973 | ||
974 | if (actlen < (sizeof(ctx->rx_ncm.nth16) + sizeof(ctx->rx_ncm.ndp16))) { | |
975 | pr_debug("frame too short\n"); | |
976 | goto error; | |
977 | } | |
978 | ||
979 | memcpy(&(ctx->rx_ncm.nth16), ((u8 *)skb_in->data), | |
980 | sizeof(ctx->rx_ncm.nth16)); | |
981 | ||
982 | if (le32_to_cpu(ctx->rx_ncm.nth16.dwSignature) != | |
983 | USB_CDC_NCM_NTH16_SIGN) { | |
984 | pr_debug("invalid NTH16 signature <%u>\n", | |
985 | le32_to_cpu(ctx->rx_ncm.nth16.dwSignature)); | |
986 | goto error; | |
987 | } | |
988 | ||
989 | temp = le16_to_cpu(ctx->rx_ncm.nth16.wBlockLength); | |
990 | if (temp > sumlen) { | |
991 | pr_debug("unsupported NTB block length %u/%u\n", temp, sumlen); | |
992 | goto error; | |
993 | } | |
994 | ||
84e77a8b | 995 | temp = le16_to_cpu(ctx->rx_ncm.nth16.wNdpIndex); |
900d495a AO |
996 | if ((temp + sizeof(ctx->rx_ncm.ndp16)) > actlen) { |
997 | pr_debug("invalid DPT16 index\n"); | |
998 | goto error; | |
999 | } | |
1000 | ||
1001 | memcpy(&(ctx->rx_ncm.ndp16), ((u8 *)skb_in->data) + temp, | |
1002 | sizeof(ctx->rx_ncm.ndp16)); | |
1003 | ||
1004 | if (le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature) != | |
1005 | USB_CDC_NCM_NDP16_NOCRC_SIGN) { | |
1006 | pr_debug("invalid DPT16 signature <%u>\n", | |
1007 | le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature)); | |
1008 | goto error; | |
1009 | } | |
1010 | ||
1011 | if (le16_to_cpu(ctx->rx_ncm.ndp16.wLength) < | |
1012 | USB_CDC_NCM_NDP16_LENGTH_MIN) { | |
1013 | pr_debug("invalid DPT16 length <%u>\n", | |
1014 | le32_to_cpu(ctx->rx_ncm.ndp16.dwSignature)); | |
1015 | goto error; | |
1016 | } | |
1017 | ||
1018 | nframes = ((le16_to_cpu(ctx->rx_ncm.ndp16.wLength) - | |
1019 | sizeof(struct usb_cdc_ncm_ndp16)) / | |
1020 | sizeof(struct usb_cdc_ncm_dpe16)); | |
1021 | nframes--; /* we process NDP entries except for the last one */ | |
1022 | ||
1023 | pr_debug("nframes = %u\n", nframes); | |
1024 | ||
1025 | temp += sizeof(ctx->rx_ncm.ndp16); | |
1026 | ||
1027 | if ((temp + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > actlen) { | |
1028 | pr_debug("Invalid nframes = %d\n", nframes); | |
1029 | goto error; | |
1030 | } | |
1031 | ||
1032 | if (nframes > CDC_NCM_DPT_DATAGRAMS_MAX) { | |
1033 | pr_debug("Truncating number of frames from %u to %u\n", | |
1034 | nframes, CDC_NCM_DPT_DATAGRAMS_MAX); | |
1035 | nframes = CDC_NCM_DPT_DATAGRAMS_MAX; | |
1036 | } | |
1037 | ||
1038 | memcpy(&(ctx->rx_ncm.dpe16), ((u8 *)skb_in->data) + temp, | |
1039 | nframes * (sizeof(struct usb_cdc_ncm_dpe16))); | |
1040 | ||
1041 | for (x = 0; x < nframes; x++) { | |
1042 | offset = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramIndex); | |
1043 | temp = le16_to_cpu(ctx->rx_ncm.dpe16[x].wDatagramLength); | |
1044 | ||
1045 | /* | |
1046 | * CDC NCM ch. 3.7 | |
1047 | * All entries after first NULL entry are to be ignored | |
1048 | */ | |
1049 | if ((offset == 0) || (temp == 0)) { | |
1050 | if (!x) | |
1051 | goto error; /* empty NTB */ | |
1052 | break; | |
1053 | } | |
1054 | ||
1055 | /* sanity checking */ | |
1056 | if (((offset + temp) > actlen) || | |
1057 | (temp > CDC_NCM_MAX_DATAGRAM_SIZE) || (temp < ETH_HLEN)) { | |
1058 | pr_debug("invalid frame detected (ignored)" | |
f742aa8a AO |
1059 | "offset[%u]=%u, length=%u, skb=%p\n", |
1060 | x, offset, temp, skb_in); | |
900d495a AO |
1061 | if (!x) |
1062 | goto error; | |
1063 | break; | |
1064 | ||
1065 | } else { | |
1066 | skb = skb_clone(skb_in, GFP_ATOMIC); | |
9e56790a JJ |
1067 | if (!skb) |
1068 | goto error; | |
900d495a AO |
1069 | skb->len = temp; |
1070 | skb->data = ((u8 *)skb_in->data) + offset; | |
1071 | skb_set_tail_pointer(skb, temp); | |
1072 | usbnet_skb_return(dev, skb); | |
1073 | } | |
1074 | } | |
1075 | return 1; | |
1076 | error: | |
1077 | return 0; | |
1078 | } | |
1079 | ||
1080 | static void | |
1081 | cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx, | |
84e77a8b | 1082 | struct usb_cdc_speed_change *data) |
900d495a | 1083 | { |
84e77a8b AO |
1084 | uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); |
1085 | uint32_t tx_speed = le32_to_cpu(data->ULBitRate); | |
900d495a AO |
1086 | |
1087 | /* | |
1088 | * Currently the USB-NET API does not support reporting the actual | |
1089 | * device speed. Do print it instead. | |
1090 | */ | |
1091 | if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) { | |
1092 | ctx->tx_speed = tx_speed; | |
1093 | ctx->rx_speed = rx_speed; | |
1094 | ||
1095 | if ((tx_speed > 1000000) && (rx_speed > 1000000)) { | |
1096 | printk(KERN_INFO KBUILD_MODNAME | |
1097 | ": %s: %u mbit/s downlink " | |
1098 | "%u mbit/s uplink\n", | |
1099 | ctx->netdev->name, | |
1100 | (unsigned int)(rx_speed / 1000000U), | |
1101 | (unsigned int)(tx_speed / 1000000U)); | |
1102 | } else { | |
1103 | printk(KERN_INFO KBUILD_MODNAME | |
1104 | ": %s: %u kbit/s downlink " | |
1105 | "%u kbit/s uplink\n", | |
1106 | ctx->netdev->name, | |
1107 | (unsigned int)(rx_speed / 1000U), | |
1108 | (unsigned int)(tx_speed / 1000U)); | |
1109 | } | |
1110 | } | |
1111 | } | |
1112 | ||
1113 | static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) | |
1114 | { | |
1115 | struct cdc_ncm_ctx *ctx; | |
1116 | struct usb_cdc_notification *event; | |
1117 | ||
1118 | ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
1119 | ||
1120 | if (urb->actual_length < sizeof(*event)) | |
1121 | return; | |
1122 | ||
1123 | /* test for split data in 8-byte chunks */ | |
1124 | if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { | |
1125 | cdc_ncm_speed_change(ctx, | |
84e77a8b | 1126 | (struct usb_cdc_speed_change *)urb->transfer_buffer); |
900d495a AO |
1127 | return; |
1128 | } | |
1129 | ||
1130 | event = urb->transfer_buffer; | |
1131 | ||
1132 | switch (event->bNotificationType) { | |
1133 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
1134 | /* | |
1135 | * According to the CDC NCM specification ch.7.1 | |
1136 | * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be | |
1137 | * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. | |
1138 | */ | |
1139 | ctx->connected = event->wValue; | |
1140 | ||
1141 | printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:" | |
1142 | " %sconnected\n", | |
1143 | ctx->netdev->name, ctx->connected ? "" : "dis"); | |
1144 | ||
1145 | if (ctx->connected) | |
1146 | netif_carrier_on(dev->net); | |
1147 | else { | |
1148 | netif_carrier_off(dev->net); | |
1149 | ctx->tx_speed = ctx->rx_speed = 0; | |
1150 | } | |
1151 | break; | |
1152 | ||
1153 | case USB_CDC_NOTIFY_SPEED_CHANGE: | |
84e77a8b AO |
1154 | if (urb->actual_length < (sizeof(*event) + |
1155 | sizeof(struct usb_cdc_speed_change))) | |
900d495a AO |
1156 | set_bit(EVENT_STS_SPLIT, &dev->flags); |
1157 | else | |
1158 | cdc_ncm_speed_change(ctx, | |
84e77a8b | 1159 | (struct usb_cdc_speed_change *) &event[1]); |
900d495a AO |
1160 | break; |
1161 | ||
1162 | default: | |
1163 | dev_err(&dev->udev->dev, "NCM: unexpected " | |
1164 | "notification 0x%02x!\n", event->bNotificationType); | |
1165 | break; | |
1166 | } | |
1167 | } | |
1168 | ||
1169 | static int cdc_ncm_check_connect(struct usbnet *dev) | |
1170 | { | |
1171 | struct cdc_ncm_ctx *ctx; | |
1172 | ||
1173 | ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
1174 | if (ctx == NULL) | |
1175 | return 1; /* disconnected */ | |
1176 | ||
1177 | return !ctx->connected; | |
1178 | } | |
1179 | ||
1180 | static int | |
1181 | cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod) | |
1182 | { | |
1183 | return usbnet_probe(udev, prod); | |
1184 | } | |
1185 | ||
1186 | static void cdc_ncm_disconnect(struct usb_interface *intf) | |
1187 | { | |
1188 | struct usbnet *dev = usb_get_intfdata(intf); | |
1189 | ||
1190 | if (dev == NULL) | |
1191 | return; /* already disconnected */ | |
1192 | ||
1193 | usbnet_disconnect(intf); | |
1194 | } | |
1195 | ||
1196 | static int cdc_ncm_manage_power(struct usbnet *dev, int status) | |
1197 | { | |
1198 | dev->intf->needs_remote_wakeup = status; | |
1199 | return 0; | |
1200 | } | |
1201 | ||
1202 | static const struct driver_info cdc_ncm_info = { | |
1203 | .description = "CDC NCM", | |
c261344d | 1204 | .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET, |
900d495a AO |
1205 | .bind = cdc_ncm_bind, |
1206 | .unbind = cdc_ncm_unbind, | |
1207 | .check_connect = cdc_ncm_check_connect, | |
1208 | .manage_power = cdc_ncm_manage_power, | |
1209 | .status = cdc_ncm_status, | |
1210 | .rx_fixup = cdc_ncm_rx_fixup, | |
1211 | .tx_fixup = cdc_ncm_tx_fixup, | |
1212 | }; | |
1213 | ||
1214 | static struct usb_driver cdc_ncm_driver = { | |
1215 | .name = "cdc_ncm", | |
1216 | .id_table = cdc_devs, | |
1217 | .probe = cdc_ncm_probe, | |
1218 | .disconnect = cdc_ncm_disconnect, | |
1219 | .suspend = usbnet_suspend, | |
1220 | .resume = usbnet_resume, | |
85e3c65f | 1221 | .reset_resume = usbnet_resume, |
900d495a AO |
1222 | .supports_autosuspend = 1, |
1223 | }; | |
1224 | ||
1225 | static struct ethtool_ops cdc_ncm_ethtool_ops = { | |
1226 | .get_drvinfo = cdc_ncm_get_drvinfo, | |
1227 | .get_link = usbnet_get_link, | |
1228 | .get_msglevel = usbnet_get_msglevel, | |
1229 | .set_msglevel = usbnet_set_msglevel, | |
1230 | .get_settings = usbnet_get_settings, | |
1231 | .set_settings = usbnet_set_settings, | |
1232 | .nway_reset = usbnet_nway_reset, | |
1233 | }; | |
1234 | ||
1235 | static int __init cdc_ncm_init(void) | |
1236 | { | |
1237 | printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION "\n"); | |
1238 | return usb_register(&cdc_ncm_driver); | |
1239 | } | |
1240 | ||
1241 | module_init(cdc_ncm_init); | |
1242 | ||
1243 | static void __exit cdc_ncm_exit(void) | |
1244 | { | |
1245 | usb_deregister(&cdc_ncm_driver); | |
1246 | } | |
1247 | ||
1248 | module_exit(cdc_ncm_exit); | |
1249 | ||
1250 | MODULE_AUTHOR("Hans Petter Selasky"); | |
1251 | MODULE_DESCRIPTION("USB CDC NCM host driver"); | |
1252 | MODULE_LICENSE("Dual BSD/GPL"); |