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900d495a AO |
1 | /* |
2 | * cdc_ncm.c | |
3 | * | |
c84ff1d6 | 4 | * Copyright (C) ST-Ericsson 2010-2012 |
900d495a AO |
5 | * Contact: Alexey Orishko <alexey.orishko@stericsson.com> |
6 | * Original author: Hans Petter Selasky <hans.petter.selasky@stericsson.com> | |
7 | * | |
8 | * USB Host Driver for Network Control Model (NCM) | |
9 | * http://www.usb.org/developers/devclass_docs/NCM10.zip | |
10 | * | |
11 | * The NCM encoding, decoding and initialization logic | |
12 | * derives from FreeBSD 8.x. if_cdce.c and if_cdcereg.h | |
13 | * | |
14 | * This software is available to you under a choice of one of two | |
15 | * licenses. You may choose this file to be licensed under the terms | |
16 | * of the GNU General Public License (GPL) Version 2 or the 2-clause | |
17 | * BSD license listed below: | |
18 | * | |
19 | * Redistribution and use in source and binary forms, with or without | |
20 | * modification, are permitted provided that the following conditions | |
21 | * are met: | |
22 | * 1. Redistributions of source code must retain the above copyright | |
23 | * notice, this list of conditions and the following disclaimer. | |
24 | * 2. Redistributions in binary form must reproduce the above copyright | |
25 | * notice, this list of conditions and the following disclaimer in the | |
26 | * documentation and/or other materials provided with the distribution. | |
27 | * | |
28 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |
29 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
30 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
31 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |
32 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
33 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
34 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
35 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
37 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
38 | * SUCH DAMAGE. | |
39 | */ | |
40 | ||
41 | #include <linux/module.h> | |
42 | #include <linux/init.h> | |
43 | #include <linux/netdevice.h> | |
44 | #include <linux/ctype.h> | |
45 | #include <linux/ethtool.h> | |
46 | #include <linux/workqueue.h> | |
47 | #include <linux/mii.h> | |
48 | #include <linux/crc32.h> | |
49 | #include <linux/usb.h> | |
c84ff1d6 | 50 | #include <linux/hrtimer.h> |
900d495a AO |
51 | #include <linux/atomic.h> |
52 | #include <linux/usb/usbnet.h> | |
53 | #include <linux/usb/cdc.h> | |
54 | ||
c84ff1d6 | 55 | #define DRIVER_VERSION "14-Mar-2012" |
900d495a AO |
56 | |
57 | /* CDC NCM subclass 3.2.1 */ | |
58 | #define USB_CDC_NCM_NDP16_LENGTH_MIN 0x10 | |
59 | ||
60 | /* Maximum NTB length */ | |
3f658cde AO |
61 | #define CDC_NCM_NTB_MAX_SIZE_TX 32768 /* bytes */ |
62 | #define CDC_NCM_NTB_MAX_SIZE_RX 32768 /* bytes */ | |
900d495a AO |
63 | |
64 | /* Minimum value for MaxDatagramSize, ch. 6.2.9 */ | |
65 | #define CDC_NCM_MIN_DATAGRAM_SIZE 1514 /* bytes */ | |
66 | ||
67 | #define CDC_NCM_MIN_TX_PKT 512 /* bytes */ | |
68 | ||
69 | /* Default value for MaxDatagramSize */ | |
3f658cde | 70 | #define CDC_NCM_MAX_DATAGRAM_SIZE 8192 /* bytes */ |
900d495a AO |
71 | |
72 | /* | |
73 | * Maximum amount of datagrams in NCM Datagram Pointer Table, not counting | |
d5ddb4a5 | 74 | * the last NULL entry. |
900d495a | 75 | */ |
3f658cde | 76 | #define CDC_NCM_DPT_DATAGRAMS_MAX 40 |
900d495a AO |
77 | |
78 | /* Restart the timer, if amount of datagrams is less than given value */ | |
79 | #define CDC_NCM_RESTART_TIMER_DATAGRAM_CNT 3 | |
c84ff1d6 AO |
80 | #define CDC_NCM_TIMER_PENDING_CNT 2 |
81 | #define CDC_NCM_TIMER_INTERVAL (400UL * NSEC_PER_USEC) | |
900d495a AO |
82 | |
83 | /* The following macro defines the minimum header space */ | |
84 | #define CDC_NCM_MIN_HDR_SIZE \ | |
85 | (sizeof(struct usb_cdc_ncm_nth16) + sizeof(struct usb_cdc_ncm_ndp16) + \ | |
86 | (CDC_NCM_DPT_DATAGRAMS_MAX + 1) * sizeof(struct usb_cdc_ncm_dpe16)) | |
87 | ||
900d495a AO |
88 | struct cdc_ncm_data { |
89 | struct usb_cdc_ncm_nth16 nth16; | |
90 | struct usb_cdc_ncm_ndp16 ndp16; | |
91 | struct usb_cdc_ncm_dpe16 dpe16[CDC_NCM_DPT_DATAGRAMS_MAX + 1]; | |
92 | }; | |
93 | ||
94 | struct cdc_ncm_ctx { | |
900d495a AO |
95 | struct cdc_ncm_data tx_ncm; |
96 | struct usb_cdc_ncm_ntb_parameters ncm_parm; | |
c84ff1d6 AO |
97 | struct hrtimer tx_timer; |
98 | struct tasklet_struct bh; | |
900d495a AO |
99 | |
100 | const struct usb_cdc_ncm_desc *func_desc; | |
101 | const struct usb_cdc_header_desc *header_desc; | |
102 | const struct usb_cdc_union_desc *union_desc; | |
103 | const struct usb_cdc_ether_desc *ether_desc; | |
104 | ||
105 | struct net_device *netdev; | |
106 | struct usb_device *udev; | |
107 | struct usb_host_endpoint *in_ep; | |
108 | struct usb_host_endpoint *out_ep; | |
109 | struct usb_host_endpoint *status_ep; | |
110 | struct usb_interface *intf; | |
111 | struct usb_interface *control; | |
112 | struct usb_interface *data; | |
113 | ||
114 | struct sk_buff *tx_curr_skb; | |
115 | struct sk_buff *tx_rem_skb; | |
116 | ||
117 | spinlock_t mtx; | |
c84ff1d6 | 118 | atomic_t stop; |
900d495a AO |
119 | |
120 | u32 tx_timer_pending; | |
121 | u32 tx_curr_offset; | |
122 | u32 tx_curr_last_offset; | |
123 | u32 tx_curr_frame_num; | |
124 | u32 rx_speed; | |
125 | u32 tx_speed; | |
126 | u32 rx_max; | |
127 | u32 tx_max; | |
128 | u32 max_datagram_size; | |
129 | u16 tx_max_datagrams; | |
130 | u16 tx_remainder; | |
131 | u16 tx_modulus; | |
132 | u16 tx_ndp_modulus; | |
133 | u16 tx_seq; | |
d5ddb4a5 | 134 | u16 rx_seq; |
900d495a | 135 | u16 connected; |
900d495a AO |
136 | }; |
137 | ||
c84ff1d6 AO |
138 | static void cdc_ncm_txpath_bh(unsigned long param); |
139 | static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx); | |
140 | static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *hr_timer); | |
900d495a AO |
141 | static const struct driver_info cdc_ncm_info; |
142 | static struct usb_driver cdc_ncm_driver; | |
bc689c97 | 143 | static const struct ethtool_ops cdc_ncm_ethtool_ops; |
900d495a AO |
144 | |
145 | static const struct usb_device_id cdc_devs[] = { | |
146 | { USB_INTERFACE_INFO(USB_CLASS_COMM, | |
147 | USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), | |
148 | .driver_info = (unsigned long)&cdc_ncm_info, | |
149 | }, | |
150 | { | |
151 | }, | |
152 | }; | |
153 | ||
154 | MODULE_DEVICE_TABLE(usb, cdc_devs); | |
155 | ||
156 | static void | |
157 | cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) | |
158 | { | |
159 | struct usbnet *dev = netdev_priv(net); | |
160 | ||
161 | strncpy(info->driver, dev->driver_name, sizeof(info->driver)); | |
162 | strncpy(info->version, DRIVER_VERSION, sizeof(info->version)); | |
163 | strncpy(info->fw_version, dev->driver_info->description, | |
164 | sizeof(info->fw_version)); | |
165 | usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info)); | |
166 | } | |
167 | ||
900d495a AO |
168 | static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx) |
169 | { | |
900d495a | 170 | u32 val; |
900d495a AO |
171 | u8 flags; |
172 | u8 iface_no; | |
173 | int err; | |
84e77a8b | 174 | u16 ntb_fmt_supported; |
900d495a AO |
175 | |
176 | iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; | |
177 | ||
36c35416 GS |
178 | err = usb_control_msg(ctx->udev, |
179 | usb_rcvctrlpipe(ctx->udev, 0), | |
180 | USB_CDC_GET_NTB_PARAMETERS, | |
181 | USB_TYPE_CLASS | USB_DIR_IN | |
182 | | USB_RECIP_INTERFACE, | |
183 | 0, iface_no, &ctx->ncm_parm, | |
184 | sizeof(ctx->ncm_parm), 10000); | |
185 | if (err < 0) { | |
900d495a AO |
186 | pr_debug("failed GET_NTB_PARAMETERS\n"); |
187 | return 1; | |
188 | } | |
189 | ||
190 | /* read correct set of parameters according to device mode */ | |
191 | ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); | |
192 | ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); | |
193 | ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); | |
194 | ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); | |
195 | ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); | |
84e77a8b AO |
196 | /* devices prior to NCM Errata shall set this field to zero */ |
197 | ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); | |
198 | ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported); | |
900d495a AO |
199 | |
200 | if (ctx->func_desc != NULL) | |
201 | flags = ctx->func_desc->bmNetworkCapabilities; | |
202 | else | |
203 | flags = 0; | |
204 | ||
205 | pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u " | |
206 | "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u " | |
84e77a8b | 207 | "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", |
900d495a | 208 | ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, |
84e77a8b | 209 | ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags); |
900d495a | 210 | |
84e77a8b AO |
211 | /* max count of tx datagrams */ |
212 | if ((ctx->tx_max_datagrams == 0) || | |
213 | (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) | |
214 | ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; | |
900d495a AO |
215 | |
216 | /* verify maximum size of received NTB in bytes */ | |
84e77a8b AO |
217 | if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) { |
218 | pr_debug("Using min receive length=%d\n", | |
219 | USB_CDC_NCM_NTB_MIN_IN_SIZE); | |
220 | ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE; | |
221 | } | |
222 | ||
223 | if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) { | |
900d495a AO |
224 | pr_debug("Using default maximum receive length=%d\n", |
225 | CDC_NCM_NTB_MAX_SIZE_RX); | |
226 | ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX; | |
227 | } | |
228 | ||
84e77a8b AO |
229 | /* inform device about NTB input size changes */ |
230 | if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) { | |
84e77a8b AO |
231 | |
232 | if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) { | |
75bc8ef5 JB |
233 | struct usb_cdc_ncm_ndp_input_size *ndp_in_sz; |
234 | ||
235 | ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL); | |
236 | if (!ndp_in_sz) { | |
237 | err = -ENOMEM; | |
238 | goto size_err; | |
239 | } | |
240 | ||
36c35416 GS |
241 | err = usb_control_msg(ctx->udev, |
242 | usb_sndctrlpipe(ctx->udev, 0), | |
243 | USB_CDC_SET_NTB_INPUT_SIZE, | |
244 | USB_TYPE_CLASS | USB_DIR_OUT | |
245 | | USB_RECIP_INTERFACE, | |
75bc8ef5 JB |
246 | 0, iface_no, ndp_in_sz, 8, 1000); |
247 | kfree(ndp_in_sz); | |
84e77a8b | 248 | } else { |
75bc8ef5 JB |
249 | __le32 *dwNtbInMaxSize; |
250 | dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize), | |
251 | GFP_KERNEL); | |
252 | if (!dwNtbInMaxSize) { | |
253 | err = -ENOMEM; | |
254 | goto size_err; | |
255 | } | |
256 | *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max); | |
257 | ||
36c35416 GS |
258 | err = usb_control_msg(ctx->udev, |
259 | usb_sndctrlpipe(ctx->udev, 0), | |
260 | USB_CDC_SET_NTB_INPUT_SIZE, | |
261 | USB_TYPE_CLASS | USB_DIR_OUT | |
262 | | USB_RECIP_INTERFACE, | |
75bc8ef5 JB |
263 | 0, iface_no, dwNtbInMaxSize, 4, 1000); |
264 | kfree(dwNtbInMaxSize); | |
84e77a8b | 265 | } |
75bc8ef5 | 266 | size_err: |
36c35416 | 267 | if (err < 0) |
84e77a8b AO |
268 | pr_debug("Setting NTB Input Size failed\n"); |
269 | } | |
270 | ||
900d495a AO |
271 | /* verify maximum size of transmitted NTB in bytes */ |
272 | if ((ctx->tx_max < | |
273 | (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) || | |
274 | (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) { | |
275 | pr_debug("Using default maximum transmit length=%d\n", | |
276 | CDC_NCM_NTB_MAX_SIZE_TX); | |
277 | ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX; | |
278 | } | |
279 | ||
280 | /* | |
281 | * verify that the structure alignment is: | |
282 | * - power of two | |
283 | * - not greater than the maximum transmit length | |
284 | * - not less than four bytes | |
285 | */ | |
286 | val = ctx->tx_ndp_modulus; | |
287 | ||
288 | if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || | |
289 | (val != ((-val) & val)) || (val >= ctx->tx_max)) { | |
290 | pr_debug("Using default alignment: 4 bytes\n"); | |
291 | ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; | |
292 | } | |
293 | ||
294 | /* | |
295 | * verify that the payload alignment is: | |
296 | * - power of two | |
297 | * - not greater than the maximum transmit length | |
298 | * - not less than four bytes | |
299 | */ | |
300 | val = ctx->tx_modulus; | |
301 | ||
302 | if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || | |
303 | (val != ((-val) & val)) || (val >= ctx->tx_max)) { | |
304 | pr_debug("Using default transmit modulus: 4 bytes\n"); | |
305 | ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; | |
306 | } | |
307 | ||
308 | /* verify the payload remainder */ | |
309 | if (ctx->tx_remainder >= ctx->tx_modulus) { | |
310 | pr_debug("Using default transmit remainder: 0 bytes\n"); | |
311 | ctx->tx_remainder = 0; | |
312 | } | |
313 | ||
314 | /* adjust TX-remainder according to NCM specification. */ | |
315 | ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) & | |
316 | (ctx->tx_modulus - 1)); | |
317 | ||
318 | /* additional configuration */ | |
319 | ||
320 | /* set CRC Mode */ | |
84e77a8b | 321 | if (flags & USB_CDC_NCM_NCAP_CRC_MODE) { |
36c35416 GS |
322 | err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), |
323 | USB_CDC_SET_CRC_MODE, | |
324 | USB_TYPE_CLASS | USB_DIR_OUT | |
325 | | USB_RECIP_INTERFACE, | |
326 | USB_CDC_NCM_CRC_NOT_APPENDED, | |
327 | iface_no, NULL, 0, 1000); | |
328 | if (err < 0) | |
84e77a8b AO |
329 | pr_debug("Setting CRC mode off failed\n"); |
330 | } | |
900d495a | 331 | |
84e77a8b AO |
332 | /* set NTB format, if both formats are supported */ |
333 | if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) { | |
36c35416 GS |
334 | err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), |
335 | USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS | |
336 | | USB_DIR_OUT | USB_RECIP_INTERFACE, | |
337 | USB_CDC_NCM_NTB16_FORMAT, | |
338 | iface_no, NULL, 0, 1000); | |
339 | if (err < 0) | |
84e77a8b AO |
340 | pr_debug("Setting NTB format to 16-bit failed\n"); |
341 | } | |
900d495a | 342 | |
84e77a8b | 343 | ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE; |
900d495a AO |
344 | |
345 | /* set Max Datagram Size (MTU) */ | |
84e77a8b | 346 | if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) { |
75bc8ef5 | 347 | __le16 *max_datagram_size; |
84e77a8b | 348 | u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); |
75bc8ef5 JB |
349 | |
350 | max_datagram_size = kzalloc(sizeof(*max_datagram_size), | |
351 | GFP_KERNEL); | |
352 | if (!max_datagram_size) { | |
353 | err = -ENOMEM; | |
354 | goto max_dgram_err; | |
355 | } | |
356 | ||
36c35416 GS |
357 | err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0), |
358 | USB_CDC_GET_MAX_DATAGRAM_SIZE, | |
359 | USB_TYPE_CLASS | USB_DIR_IN | |
360 | | USB_RECIP_INTERFACE, | |
75bc8ef5 | 361 | 0, iface_no, max_datagram_size, |
36c35416 GS |
362 | 2, 1000); |
363 | if (err < 0) { | |
84e77a8b AO |
364 | pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n", |
365 | CDC_NCM_MIN_DATAGRAM_SIZE); | |
366 | } else { | |
75bc8ef5 JB |
367 | ctx->max_datagram_size = |
368 | le16_to_cpu(*max_datagram_size); | |
84e77a8b | 369 | /* Check Eth descriptor value */ |
3f658cde | 370 | if (ctx->max_datagram_size > eth_max_sz) |
84e77a8b | 371 | ctx->max_datagram_size = eth_max_sz; |
3f658cde AO |
372 | |
373 | if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE) | |
374 | ctx->max_datagram_size = | |
84e77a8b | 375 | CDC_NCM_MAX_DATAGRAM_SIZE; |
900d495a | 376 | |
84e77a8b AO |
377 | if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE) |
378 | ctx->max_datagram_size = | |
379 | CDC_NCM_MIN_DATAGRAM_SIZE; | |
380 | ||
381 | /* if value changed, update device */ | |
3f658cde AO |
382 | if (ctx->max_datagram_size != |
383 | le16_to_cpu(*max_datagram_size)) { | |
384 | err = usb_control_msg(ctx->udev, | |
36c35416 GS |
385 | usb_sndctrlpipe(ctx->udev, 0), |
386 | USB_CDC_SET_MAX_DATAGRAM_SIZE, | |
387 | USB_TYPE_CLASS | USB_DIR_OUT | |
388 | | USB_RECIP_INTERFACE, | |
389 | 0, | |
75bc8ef5 | 390 | iface_no, max_datagram_size, |
36c35416 | 391 | 2, 1000); |
3f658cde AO |
392 | if (err < 0) |
393 | pr_debug("SET_MAX_DGRAM_SIZE failed\n"); | |
394 | } | |
84e77a8b | 395 | } |
3f658cde | 396 | kfree(max_datagram_size); |
900d495a AO |
397 | } |
398 | ||
3f658cde | 399 | max_dgram_err: |
900d495a AO |
400 | if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN)) |
401 | ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN; | |
402 | ||
403 | return 0; | |
404 | } | |
405 | ||
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 | ||
900d495a AO |
444 | if (ctx->tx_rem_skb != NULL) { |
445 | dev_kfree_skb_any(ctx->tx_rem_skb); | |
446 | ctx->tx_rem_skb = NULL; | |
447 | } | |
448 | ||
449 | if (ctx->tx_curr_skb != NULL) { | |
450 | dev_kfree_skb_any(ctx->tx_curr_skb); | |
451 | ctx->tx_curr_skb = NULL; | |
452 | } | |
453 | ||
454 | kfree(ctx); | |
455 | } | |
456 | ||
457 | static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) | |
458 | { | |
459 | struct cdc_ncm_ctx *ctx; | |
460 | struct usb_driver *driver; | |
461 | u8 *buf; | |
462 | int len; | |
463 | int temp; | |
464 | u8 iface_no; | |
465 | ||
c796984f | 466 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
900d495a | 467 | if (ctx == NULL) |
19694ac8 | 468 | return -ENODEV; |
900d495a | 469 | |
c84ff1d6 AO |
470 | hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
471 | ctx->tx_timer.function = &cdc_ncm_tx_timer_cb; | |
472 | ctx->bh.data = (unsigned long)ctx; | |
473 | ctx->bh.func = cdc_ncm_txpath_bh; | |
474 | atomic_set(&ctx->stop, 0); | |
900d495a AO |
475 | spin_lock_init(&ctx->mtx); |
476 | ctx->netdev = dev->net; | |
477 | ||
478 | /* store ctx pointer in device data field */ | |
479 | dev->data[0] = (unsigned long)ctx; | |
480 | ||
481 | /* get some pointers */ | |
482 | driver = driver_of(intf); | |
483 | buf = intf->cur_altsetting->extra; | |
484 | len = intf->cur_altsetting->extralen; | |
485 | ||
486 | ctx->udev = dev->udev; | |
487 | ctx->intf = intf; | |
488 | ||
489 | /* parse through descriptors associated with control interface */ | |
490 | while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) { | |
491 | ||
492 | if (buf[1] != USB_DT_CS_INTERFACE) | |
493 | goto advance; | |
494 | ||
495 | switch (buf[2]) { | |
496 | case USB_CDC_UNION_TYPE: | |
497 | if (buf[0] < sizeof(*(ctx->union_desc))) | |
498 | break; | |
499 | ||
500 | ctx->union_desc = | |
501 | (const struct usb_cdc_union_desc *)buf; | |
502 | ||
503 | ctx->control = usb_ifnum_to_if(dev->udev, | |
504 | ctx->union_desc->bMasterInterface0); | |
505 | ctx->data = usb_ifnum_to_if(dev->udev, | |
506 | ctx->union_desc->bSlaveInterface0); | |
507 | break; | |
508 | ||
509 | case USB_CDC_ETHERNET_TYPE: | |
510 | if (buf[0] < sizeof(*(ctx->ether_desc))) | |
511 | break; | |
512 | ||
513 | ctx->ether_desc = | |
514 | (const struct usb_cdc_ether_desc *)buf; | |
900d495a AO |
515 | dev->hard_mtu = |
516 | le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); | |
517 | ||
84e77a8b AO |
518 | if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE) |
519 | dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE; | |
520 | else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE) | |
521 | dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE; | |
900d495a AO |
522 | break; |
523 | ||
524 | case USB_CDC_NCM_TYPE: | |
525 | if (buf[0] < sizeof(*(ctx->func_desc))) | |
526 | break; | |
527 | ||
528 | ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf; | |
529 | break; | |
530 | ||
531 | default: | |
532 | break; | |
533 | } | |
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 | 583 | |
517cd81c | 584 | dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr); |
900d495a AO |
585 | |
586 | dev->in = usb_rcvbulkpipe(dev->udev, | |
587 | ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
588 | dev->out = usb_sndbulkpipe(dev->udev, | |
589 | ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
590 | dev->status = ctx->status_ep; | |
591 | dev->rx_urb_size = ctx->rx_max; | |
592 | ||
593 | /* | |
594 | * We should get an event when network connection is "connected" or | |
595 | * "disconnected". Set network connection in "disconnected" state | |
596 | * (carrier is OFF) during attach, so the IP network stack does not | |
597 | * start IPv6 negotiation and more. | |
598 | */ | |
599 | netif_carrier_off(dev->net); | |
600 | ctx->tx_speed = ctx->rx_speed = 0; | |
601 | return 0; | |
602 | ||
19694ac8 AO |
603 | error2: |
604 | usb_set_intfdata(ctx->control, NULL); | |
605 | usb_set_intfdata(ctx->data, NULL); | |
606 | usb_driver_release_interface(driver, ctx->data); | |
900d495a AO |
607 | error: |
608 | cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); | |
609 | dev->data[0] = 0; | |
19694ac8 | 610 | dev_info(&dev->udev->dev, "bind() failure\n"); |
900d495a AO |
611 | return -ENODEV; |
612 | } | |
613 | ||
614 | static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) | |
615 | { | |
616 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
19694ac8 | 617 | struct usb_driver *driver = driver_of(intf); |
900d495a AO |
618 | |
619 | if (ctx == NULL) | |
620 | return; /* no setup */ | |
621 | ||
c84ff1d6 AO |
622 | atomic_set(&ctx->stop, 1); |
623 | ||
624 | if (hrtimer_active(&ctx->tx_timer)) | |
625 | hrtimer_cancel(&ctx->tx_timer); | |
626 | ||
627 | tasklet_kill(&ctx->bh); | |
628 | ||
19694ac8 AO |
629 | /* disconnect master --> disconnect slave */ |
630 | if (intf == ctx->control && ctx->data) { | |
631 | usb_set_intfdata(ctx->data, NULL); | |
900d495a | 632 | usb_driver_release_interface(driver, ctx->data); |
19694ac8 | 633 | ctx->data = NULL; |
900d495a | 634 | |
19694ac8 AO |
635 | } else if (intf == ctx->data && ctx->control) { |
636 | usb_set_intfdata(ctx->control, NULL); | |
900d495a | 637 | usb_driver_release_interface(driver, ctx->control); |
19694ac8 | 638 | ctx->control = NULL; |
900d495a AO |
639 | } |
640 | ||
19694ac8 | 641 | usb_set_intfdata(ctx->intf, NULL); |
900d495a AO |
642 | cdc_ncm_free(ctx); |
643 | } | |
644 | ||
645 | static void cdc_ncm_zero_fill(u8 *ptr, u32 first, u32 end, u32 max) | |
646 | { | |
647 | if (first >= max) | |
648 | return; | |
649 | if (first >= end) | |
650 | return; | |
651 | if (end > max) | |
652 | end = max; | |
653 | memset(ptr + first, 0, end - first); | |
654 | } | |
655 | ||
656 | static struct sk_buff * | |
657 | cdc_ncm_fill_tx_frame(struct cdc_ncm_ctx *ctx, struct sk_buff *skb) | |
658 | { | |
659 | struct sk_buff *skb_out; | |
660 | u32 rem; | |
661 | u32 offset; | |
662 | u32 last_offset; | |
36c35416 | 663 | u16 n = 0, index; |
84e77a8b | 664 | u8 ready2send = 0; |
900d495a AO |
665 | |
666 | /* if there is a remaining skb, it gets priority */ | |
667 | if (skb != NULL) | |
668 | swap(skb, ctx->tx_rem_skb); | |
669 | else | |
84e77a8b | 670 | ready2send = 1; |
900d495a AO |
671 | |
672 | /* | |
673 | * +----------------+ | |
674 | * | skb_out | | |
675 | * +----------------+ | |
676 | * ^ offset | |
677 | * ^ last_offset | |
678 | */ | |
679 | ||
680 | /* check if we are resuming an OUT skb */ | |
681 | if (ctx->tx_curr_skb != NULL) { | |
682 | /* pop variables */ | |
683 | skb_out = ctx->tx_curr_skb; | |
684 | offset = ctx->tx_curr_offset; | |
685 | last_offset = ctx->tx_curr_last_offset; | |
686 | n = ctx->tx_curr_frame_num; | |
687 | ||
688 | } else { | |
689 | /* reset variables */ | |
6c60408e | 690 | skb_out = alloc_skb((ctx->tx_max + 1), GFP_ATOMIC); |
900d495a AO |
691 | if (skb_out == NULL) { |
692 | if (skb != NULL) { | |
693 | dev_kfree_skb_any(skb); | |
694 | ctx->netdev->stats.tx_dropped++; | |
695 | } | |
696 | goto exit_no_skb; | |
697 | } | |
698 | ||
699 | /* make room for NTH and NDP */ | |
700 | offset = ALIGN(sizeof(struct usb_cdc_ncm_nth16), | |
701 | ctx->tx_ndp_modulus) + | |
702 | sizeof(struct usb_cdc_ncm_ndp16) + | |
703 | (ctx->tx_max_datagrams + 1) * | |
704 | sizeof(struct usb_cdc_ncm_dpe16); | |
705 | ||
706 | /* store last valid offset before alignment */ | |
707 | last_offset = offset; | |
708 | /* align first Datagram offset correctly */ | |
709 | offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder; | |
710 | /* zero buffer till the first IP datagram */ | |
711 | cdc_ncm_zero_fill(skb_out->data, 0, offset, offset); | |
712 | n = 0; | |
713 | ctx->tx_curr_frame_num = 0; | |
714 | } | |
715 | ||
716 | for (; n < ctx->tx_max_datagrams; n++) { | |
717 | /* check if end of transmit buffer is reached */ | |
84e77a8b AO |
718 | if (offset >= ctx->tx_max) { |
719 | ready2send = 1; | |
900d495a | 720 | break; |
84e77a8b | 721 | } |
900d495a AO |
722 | /* compute maximum buffer size */ |
723 | rem = ctx->tx_max - offset; | |
724 | ||
725 | if (skb == NULL) { | |
726 | skb = ctx->tx_rem_skb; | |
727 | ctx->tx_rem_skb = NULL; | |
728 | ||
729 | /* check for end of skb */ | |
730 | if (skb == NULL) | |
731 | break; | |
732 | } | |
733 | ||
734 | if (skb->len > rem) { | |
735 | if (n == 0) { | |
736 | /* won't fit, MTU problem? */ | |
737 | dev_kfree_skb_any(skb); | |
738 | skb = NULL; | |
739 | ctx->netdev->stats.tx_dropped++; | |
740 | } else { | |
741 | /* no room for skb - store for later */ | |
742 | if (ctx->tx_rem_skb != NULL) { | |
743 | dev_kfree_skb_any(ctx->tx_rem_skb); | |
744 | ctx->netdev->stats.tx_dropped++; | |
745 | } | |
746 | ctx->tx_rem_skb = skb; | |
747 | skb = NULL; | |
84e77a8b | 748 | ready2send = 1; |
900d495a AO |
749 | } |
750 | break; | |
751 | } | |
752 | ||
753 | memcpy(((u8 *)skb_out->data) + offset, skb->data, skb->len); | |
754 | ||
755 | ctx->tx_ncm.dpe16[n].wDatagramLength = cpu_to_le16(skb->len); | |
756 | ctx->tx_ncm.dpe16[n].wDatagramIndex = cpu_to_le16(offset); | |
757 | ||
758 | /* update offset */ | |
759 | offset += skb->len; | |
760 | ||
761 | /* store last valid offset before alignment */ | |
762 | last_offset = offset; | |
763 | ||
764 | /* align offset correctly */ | |
765 | offset = ALIGN(offset, ctx->tx_modulus) + ctx->tx_remainder; | |
766 | ||
767 | /* zero padding */ | |
768 | cdc_ncm_zero_fill(skb_out->data, last_offset, offset, | |
769 | ctx->tx_max); | |
770 | dev_kfree_skb_any(skb); | |
771 | skb = NULL; | |
772 | } | |
773 | ||
774 | /* free up any dangling skb */ | |
775 | if (skb != NULL) { | |
776 | dev_kfree_skb_any(skb); | |
777 | skb = NULL; | |
778 | ctx->netdev->stats.tx_dropped++; | |
779 | } | |
780 | ||
781 | ctx->tx_curr_frame_num = n; | |
782 | ||
783 | if (n == 0) { | |
784 | /* wait for more frames */ | |
785 | /* push variables */ | |
786 | ctx->tx_curr_skb = skb_out; | |
787 | ctx->tx_curr_offset = offset; | |
788 | ctx->tx_curr_last_offset = last_offset; | |
789 | goto exit_no_skb; | |
790 | ||
84e77a8b | 791 | } else if ((n < ctx->tx_max_datagrams) && (ready2send == 0)) { |
900d495a AO |
792 | /* wait for more frames */ |
793 | /* push variables */ | |
794 | ctx->tx_curr_skb = skb_out; | |
795 | ctx->tx_curr_offset = offset; | |
796 | ctx->tx_curr_last_offset = last_offset; | |
797 | /* set the pending count */ | |
798 | if (n < CDC_NCM_RESTART_TIMER_DATAGRAM_CNT) | |
c84ff1d6 | 799 | ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT; |
900d495a AO |
800 | goto exit_no_skb; |
801 | ||
802 | } else { | |
803 | /* frame goes out */ | |
804 | /* variables will be reset at next call */ | |
805 | } | |
806 | ||
807 | /* check for overflow */ | |
808 | if (last_offset > ctx->tx_max) | |
809 | last_offset = ctx->tx_max; | |
810 | ||
811 | /* revert offset */ | |
812 | offset = last_offset; | |
813 | ||
814 | /* | |
815 | * If collected data size is less or equal CDC_NCM_MIN_TX_PKT bytes, | |
816 | * we send buffers as it is. If we get more data, it would be more | |
817 | * efficient for USB HS mobile device with DMA engine to receive a full | |
818 | * size NTB, than canceling DMA transfer and receiving a short packet. | |
819 | */ | |
820 | if (offset > CDC_NCM_MIN_TX_PKT) | |
821 | offset = ctx->tx_max; | |
822 | ||
823 | /* final zero padding */ | |
824 | cdc_ncm_zero_fill(skb_out->data, last_offset, offset, ctx->tx_max); | |
825 | ||
826 | /* store last offset */ | |
827 | last_offset = offset; | |
828 | ||
6c60408e AO |
829 | if (((last_offset < ctx->tx_max) && ((last_offset % |
830 | le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) || | |
831 | (((last_offset == ctx->tx_max) && ((ctx->tx_max % | |
832 | le16_to_cpu(ctx->out_ep->desc.wMaxPacketSize)) == 0)) && | |
833 | (ctx->tx_max < le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize)))) { | |
900d495a AO |
834 | /* force short packet */ |
835 | *(((u8 *)skb_out->data) + last_offset) = 0; | |
836 | last_offset++; | |
837 | } | |
838 | ||
839 | /* zero the rest of the DPEs plus the last NULL entry */ | |
840 | for (; n <= CDC_NCM_DPT_DATAGRAMS_MAX; n++) { | |
841 | ctx->tx_ncm.dpe16[n].wDatagramLength = 0; | |
842 | ctx->tx_ncm.dpe16[n].wDatagramIndex = 0; | |
843 | } | |
844 | ||
845 | /* fill out 16-bit NTB header */ | |
846 | ctx->tx_ncm.nth16.dwSignature = cpu_to_le32(USB_CDC_NCM_NTH16_SIGN); | |
847 | ctx->tx_ncm.nth16.wHeaderLength = | |
848 | cpu_to_le16(sizeof(ctx->tx_ncm.nth16)); | |
849 | ctx->tx_ncm.nth16.wSequence = cpu_to_le16(ctx->tx_seq); | |
850 | ctx->tx_ncm.nth16.wBlockLength = cpu_to_le16(last_offset); | |
36c35416 GS |
851 | index = ALIGN(sizeof(struct usb_cdc_ncm_nth16), ctx->tx_ndp_modulus); |
852 | ctx->tx_ncm.nth16.wNdpIndex = cpu_to_le16(index); | |
900d495a AO |
853 | |
854 | memcpy(skb_out->data, &(ctx->tx_ncm.nth16), sizeof(ctx->tx_ncm.nth16)); | |
855 | ctx->tx_seq++; | |
856 | ||
857 | /* fill out 16-bit NDP table */ | |
858 | ctx->tx_ncm.ndp16.dwSignature = | |
859 | cpu_to_le32(USB_CDC_NCM_NDP16_NOCRC_SIGN); | |
860 | rem = sizeof(ctx->tx_ncm.ndp16) + ((ctx->tx_curr_frame_num + 1) * | |
861 | sizeof(struct usb_cdc_ncm_dpe16)); | |
862 | ctx->tx_ncm.ndp16.wLength = cpu_to_le16(rem); | |
84e77a8b | 863 | ctx->tx_ncm.ndp16.wNextNdpIndex = 0; /* reserved */ |
900d495a | 864 | |
36c35416 | 865 | memcpy(((u8 *)skb_out->data) + index, |
900d495a AO |
866 | &(ctx->tx_ncm.ndp16), |
867 | sizeof(ctx->tx_ncm.ndp16)); | |
868 | ||
36c35416 | 869 | memcpy(((u8 *)skb_out->data) + index + sizeof(ctx->tx_ncm.ndp16), |
900d495a AO |
870 | &(ctx->tx_ncm.dpe16), |
871 | (ctx->tx_curr_frame_num + 1) * | |
872 | sizeof(struct usb_cdc_ncm_dpe16)); | |
873 | ||
874 | /* set frame length */ | |
875 | skb_put(skb_out, last_offset); | |
876 | ||
877 | /* return skb */ | |
878 | ctx->tx_curr_skb = NULL; | |
c84ff1d6 | 879 | ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num; |
900d495a AO |
880 | return skb_out; |
881 | ||
882 | exit_no_skb: | |
c84ff1d6 AO |
883 | /* Start timer, if there is a remaining skb */ |
884 | if (ctx->tx_curr_skb != NULL) | |
885 | cdc_ncm_tx_timeout_start(ctx); | |
900d495a AO |
886 | return NULL; |
887 | } | |
888 | ||
889 | static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) | |
890 | { | |
891 | /* start timer, if not already started */ | |
c84ff1d6 AO |
892 | if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop))) |
893 | hrtimer_start(&ctx->tx_timer, | |
894 | ktime_set(0, CDC_NCM_TIMER_INTERVAL), | |
895 | HRTIMER_MODE_REL); | |
900d495a AO |
896 | } |
897 | ||
c84ff1d6 | 898 | static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer) |
900d495a | 899 | { |
c84ff1d6 AO |
900 | struct cdc_ncm_ctx *ctx = |
901 | container_of(timer, struct cdc_ncm_ctx, tx_timer); | |
900d495a | 902 | |
c84ff1d6 AO |
903 | if (!atomic_read(&ctx->stop)) |
904 | tasklet_schedule(&ctx->bh); | |
905 | return HRTIMER_NORESTART; | |
906 | } | |
900d495a | 907 | |
c84ff1d6 AO |
908 | static void cdc_ncm_txpath_bh(unsigned long param) |
909 | { | |
910 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param; | |
900d495a | 911 | |
c84ff1d6 AO |
912 | spin_lock_bh(&ctx->mtx); |
913 | if (ctx->tx_timer_pending != 0) { | |
914 | ctx->tx_timer_pending--; | |
900d495a | 915 | cdc_ncm_tx_timeout_start(ctx); |
c84ff1d6 | 916 | spin_unlock_bh(&ctx->mtx); |
f742aa8a | 917 | } else if (ctx->netdev != NULL) { |
c84ff1d6 AO |
918 | spin_unlock_bh(&ctx->mtx); |
919 | netif_tx_lock_bh(ctx->netdev); | |
900d495a | 920 | usbnet_start_xmit(NULL, ctx->netdev); |
c84ff1d6 | 921 | netif_tx_unlock_bh(ctx->netdev); |
f742aa8a | 922 | } |
900d495a AO |
923 | } |
924 | ||
925 | static struct sk_buff * | |
926 | cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) | |
927 | { | |
928 | struct sk_buff *skb_out; | |
929 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
900d495a AO |
930 | |
931 | /* | |
932 | * The Ethernet API we are using does not support transmitting | |
933 | * multiple Ethernet frames in a single call. This driver will | |
934 | * accumulate multiple Ethernet frames and send out a larger | |
935 | * USB frame when the USB buffer is full or when a single jiffies | |
936 | * timeout happens. | |
937 | */ | |
938 | if (ctx == NULL) | |
939 | goto error; | |
940 | ||
c84ff1d6 | 941 | spin_lock_bh(&ctx->mtx); |
900d495a | 942 | skb_out = cdc_ncm_fill_tx_frame(ctx, skb); |
c84ff1d6 | 943 | spin_unlock_bh(&ctx->mtx); |
900d495a AO |
944 | return skb_out; |
945 | ||
946 | error: | |
947 | if (skb != NULL) | |
948 | dev_kfree_skb_any(skb); | |
949 | ||
950 | return NULL; | |
951 | } | |
952 | ||
953 | static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) | |
954 | { | |
955 | struct sk_buff *skb; | |
d5ddb4a5 AO |
956 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
957 | int len; | |
900d495a AO |
958 | int nframes; |
959 | int x; | |
960 | int offset; | |
d5ddb4a5 AO |
961 | struct usb_cdc_ncm_nth16 *nth16; |
962 | struct usb_cdc_ncm_ndp16 *ndp16; | |
963 | struct usb_cdc_ncm_dpe16 *dpe16; | |
900d495a | 964 | |
900d495a AO |
965 | if (ctx == NULL) |
966 | goto error; | |
967 | ||
d5ddb4a5 AO |
968 | if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) + |
969 | sizeof(struct usb_cdc_ncm_ndp16))) { | |
900d495a AO |
970 | pr_debug("frame too short\n"); |
971 | goto error; | |
972 | } | |
973 | ||
d5ddb4a5 | 974 | nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data; |
900d495a | 975 | |
d5ddb4a5 | 976 | if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) { |
900d495a | 977 | pr_debug("invalid NTH16 signature <%u>\n", |
d5ddb4a5 | 978 | le32_to_cpu(nth16->dwSignature)); |
900d495a AO |
979 | goto error; |
980 | } | |
981 | ||
d5ddb4a5 AO |
982 | len = le16_to_cpu(nth16->wBlockLength); |
983 | if (len > ctx->rx_max) { | |
984 | pr_debug("unsupported NTB block length %u/%u\n", len, | |
985 | ctx->rx_max); | |
900d495a AO |
986 | goto error; |
987 | } | |
988 | ||
d5ddb4a5 AO |
989 | if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) && |
990 | (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) && | |
991 | !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) { | |
992 | pr_debug("sequence number glitch prev=%d curr=%d\n", | |
993 | ctx->rx_seq, le16_to_cpu(nth16->wSequence)); | |
994 | } | |
995 | ctx->rx_seq = le16_to_cpu(nth16->wSequence); | |
996 | ||
997 | len = le16_to_cpu(nth16->wNdpIndex); | |
998 | if ((len + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) { | |
999 | pr_debug("invalid DPT16 index <%u>\n", | |
1000 | le16_to_cpu(nth16->wNdpIndex)); | |
900d495a AO |
1001 | goto error; |
1002 | } | |
1003 | ||
d5ddb4a5 | 1004 | ndp16 = (struct usb_cdc_ncm_ndp16 *)(((u8 *)skb_in->data) + len); |
900d495a | 1005 | |
d5ddb4a5 | 1006 | if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) { |
900d495a | 1007 | pr_debug("invalid DPT16 signature <%u>\n", |
d5ddb4a5 | 1008 | le32_to_cpu(ndp16->dwSignature)); |
900d495a AO |
1009 | goto error; |
1010 | } | |
1011 | ||
d5ddb4a5 | 1012 | if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) { |
900d495a | 1013 | pr_debug("invalid DPT16 length <%u>\n", |
d5ddb4a5 | 1014 | le32_to_cpu(ndp16->dwSignature)); |
900d495a AO |
1015 | goto error; |
1016 | } | |
1017 | ||
d5ddb4a5 | 1018 | nframes = ((le16_to_cpu(ndp16->wLength) - |
900d495a AO |
1019 | sizeof(struct usb_cdc_ncm_ndp16)) / |
1020 | sizeof(struct usb_cdc_ncm_dpe16)); | |
1021 | nframes--; /* we process NDP entries except for the last one */ | |
1022 | ||
d5ddb4a5 | 1023 | len += sizeof(struct usb_cdc_ncm_ndp16); |
900d495a | 1024 | |
d5ddb4a5 AO |
1025 | if ((len + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > |
1026 | skb_in->len) { | |
900d495a AO |
1027 | pr_debug("Invalid nframes = %d\n", nframes); |
1028 | goto error; | |
1029 | } | |
1030 | ||
d5ddb4a5 | 1031 | dpe16 = (struct usb_cdc_ncm_dpe16 *)(((u8 *)skb_in->data) + len); |
900d495a | 1032 | |
d5ddb4a5 AO |
1033 | for (x = 0; x < nframes; x++, dpe16++) { |
1034 | offset = le16_to_cpu(dpe16->wDatagramIndex); | |
1035 | len = le16_to_cpu(dpe16->wDatagramLength); | |
900d495a AO |
1036 | |
1037 | /* | |
1038 | * CDC NCM ch. 3.7 | |
1039 | * All entries after first NULL entry are to be ignored | |
1040 | */ | |
d5ddb4a5 | 1041 | if ((offset == 0) || (len == 0)) { |
900d495a AO |
1042 | if (!x) |
1043 | goto error; /* empty NTB */ | |
1044 | break; | |
1045 | } | |
1046 | ||
1047 | /* sanity checking */ | |
d5ddb4a5 AO |
1048 | if (((offset + len) > skb_in->len) || |
1049 | (len > ctx->rx_max) || (len < ETH_HLEN)) { | |
900d495a | 1050 | pr_debug("invalid frame detected (ignored)" |
f742aa8a | 1051 | "offset[%u]=%u, length=%u, skb=%p\n", |
d5ddb4a5 | 1052 | x, offset, len, skb_in); |
900d495a AO |
1053 | if (!x) |
1054 | goto error; | |
1055 | break; | |
1056 | ||
1057 | } else { | |
1058 | skb = skb_clone(skb_in, GFP_ATOMIC); | |
9e56790a JJ |
1059 | if (!skb) |
1060 | goto error; | |
d5ddb4a5 | 1061 | skb->len = len; |
900d495a | 1062 | skb->data = ((u8 *)skb_in->data) + offset; |
d5ddb4a5 | 1063 | skb_set_tail_pointer(skb, len); |
900d495a AO |
1064 | usbnet_skb_return(dev, skb); |
1065 | } | |
1066 | } | |
1067 | return 1; | |
1068 | error: | |
1069 | return 0; | |
1070 | } | |
1071 | ||
1072 | static void | |
1073 | cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx, | |
84e77a8b | 1074 | struct usb_cdc_speed_change *data) |
900d495a | 1075 | { |
84e77a8b AO |
1076 | uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); |
1077 | uint32_t tx_speed = le32_to_cpu(data->ULBitRate); | |
900d495a AO |
1078 | |
1079 | /* | |
1080 | * Currently the USB-NET API does not support reporting the actual | |
1081 | * device speed. Do print it instead. | |
1082 | */ | |
1083 | if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) { | |
1084 | ctx->tx_speed = tx_speed; | |
1085 | ctx->rx_speed = rx_speed; | |
1086 | ||
1087 | if ((tx_speed > 1000000) && (rx_speed > 1000000)) { | |
1088 | printk(KERN_INFO KBUILD_MODNAME | |
1089 | ": %s: %u mbit/s downlink " | |
1090 | "%u mbit/s uplink\n", | |
1091 | ctx->netdev->name, | |
1092 | (unsigned int)(rx_speed / 1000000U), | |
1093 | (unsigned int)(tx_speed / 1000000U)); | |
1094 | } else { | |
1095 | printk(KERN_INFO KBUILD_MODNAME | |
1096 | ": %s: %u kbit/s downlink " | |
1097 | "%u kbit/s uplink\n", | |
1098 | ctx->netdev->name, | |
1099 | (unsigned int)(rx_speed / 1000U), | |
1100 | (unsigned int)(tx_speed / 1000U)); | |
1101 | } | |
1102 | } | |
1103 | } | |
1104 | ||
1105 | static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) | |
1106 | { | |
1107 | struct cdc_ncm_ctx *ctx; | |
1108 | struct usb_cdc_notification *event; | |
1109 | ||
1110 | ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
1111 | ||
1112 | if (urb->actual_length < sizeof(*event)) | |
1113 | return; | |
1114 | ||
1115 | /* test for split data in 8-byte chunks */ | |
1116 | if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { | |
1117 | cdc_ncm_speed_change(ctx, | |
84e77a8b | 1118 | (struct usb_cdc_speed_change *)urb->transfer_buffer); |
900d495a AO |
1119 | return; |
1120 | } | |
1121 | ||
1122 | event = urb->transfer_buffer; | |
1123 | ||
1124 | switch (event->bNotificationType) { | |
1125 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
1126 | /* | |
1127 | * According to the CDC NCM specification ch.7.1 | |
1128 | * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be | |
1129 | * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. | |
1130 | */ | |
1131 | ctx->connected = event->wValue; | |
1132 | ||
1133 | printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:" | |
1134 | " %sconnected\n", | |
1135 | ctx->netdev->name, ctx->connected ? "" : "dis"); | |
1136 | ||
1137 | if (ctx->connected) | |
1138 | netif_carrier_on(dev->net); | |
1139 | else { | |
1140 | netif_carrier_off(dev->net); | |
1141 | ctx->tx_speed = ctx->rx_speed = 0; | |
1142 | } | |
1143 | break; | |
1144 | ||
1145 | case USB_CDC_NOTIFY_SPEED_CHANGE: | |
84e77a8b AO |
1146 | if (urb->actual_length < (sizeof(*event) + |
1147 | sizeof(struct usb_cdc_speed_change))) | |
900d495a AO |
1148 | set_bit(EVENT_STS_SPLIT, &dev->flags); |
1149 | else | |
1150 | cdc_ncm_speed_change(ctx, | |
84e77a8b | 1151 | (struct usb_cdc_speed_change *) &event[1]); |
900d495a AO |
1152 | break; |
1153 | ||
1154 | default: | |
1155 | dev_err(&dev->udev->dev, "NCM: unexpected " | |
1156 | "notification 0x%02x!\n", event->bNotificationType); | |
1157 | break; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | static int cdc_ncm_check_connect(struct usbnet *dev) | |
1162 | { | |
1163 | struct cdc_ncm_ctx *ctx; | |
1164 | ||
1165 | ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
1166 | if (ctx == NULL) | |
1167 | return 1; /* disconnected */ | |
1168 | ||
1169 | return !ctx->connected; | |
1170 | } | |
1171 | ||
1172 | static int | |
1173 | cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod) | |
1174 | { | |
1175 | return usbnet_probe(udev, prod); | |
1176 | } | |
1177 | ||
1178 | static void cdc_ncm_disconnect(struct usb_interface *intf) | |
1179 | { | |
1180 | struct usbnet *dev = usb_get_intfdata(intf); | |
1181 | ||
1182 | if (dev == NULL) | |
1183 | return; /* already disconnected */ | |
1184 | ||
1185 | usbnet_disconnect(intf); | |
1186 | } | |
1187 | ||
1188 | static int cdc_ncm_manage_power(struct usbnet *dev, int status) | |
1189 | { | |
1190 | dev->intf->needs_remote_wakeup = status; | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | static const struct driver_info cdc_ncm_info = { | |
1195 | .description = "CDC NCM", | |
c261344d | 1196 | .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET, |
900d495a AO |
1197 | .bind = cdc_ncm_bind, |
1198 | .unbind = cdc_ncm_unbind, | |
1199 | .check_connect = cdc_ncm_check_connect, | |
1200 | .manage_power = cdc_ncm_manage_power, | |
1201 | .status = cdc_ncm_status, | |
1202 | .rx_fixup = cdc_ncm_rx_fixup, | |
1203 | .tx_fixup = cdc_ncm_tx_fixup, | |
1204 | }; | |
1205 | ||
1206 | static struct usb_driver cdc_ncm_driver = { | |
1207 | .name = "cdc_ncm", | |
1208 | .id_table = cdc_devs, | |
1209 | .probe = cdc_ncm_probe, | |
1210 | .disconnect = cdc_ncm_disconnect, | |
1211 | .suspend = usbnet_suspend, | |
1212 | .resume = usbnet_resume, | |
85e3c65f | 1213 | .reset_resume = usbnet_resume, |
900d495a | 1214 | .supports_autosuspend = 1, |
e1f12eb6 | 1215 | .disable_hub_initiated_lpm = 1, |
900d495a AO |
1216 | }; |
1217 | ||
bc689c97 | 1218 | static const struct ethtool_ops cdc_ncm_ethtool_ops = { |
900d495a AO |
1219 | .get_drvinfo = cdc_ncm_get_drvinfo, |
1220 | .get_link = usbnet_get_link, | |
1221 | .get_msglevel = usbnet_get_msglevel, | |
1222 | .set_msglevel = usbnet_set_msglevel, | |
1223 | .get_settings = usbnet_get_settings, | |
1224 | .set_settings = usbnet_set_settings, | |
1225 | .nway_reset = usbnet_nway_reset, | |
1226 | }; | |
1227 | ||
d632eb1b | 1228 | module_usb_driver(cdc_ncm_driver); |
900d495a AO |
1229 | |
1230 | MODULE_AUTHOR("Hans Petter Selasky"); | |
1231 | MODULE_DESCRIPTION("USB CDC NCM host driver"); | |
1232 | MODULE_LICENSE("Dual BSD/GPL"); |