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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 | 141 | static struct usb_driver cdc_ncm_driver; |
900d495a AO |
142 | |
143 | static void | |
144 | cdc_ncm_get_drvinfo(struct net_device *net, struct ethtool_drvinfo *info) | |
145 | { | |
146 | struct usbnet *dev = netdev_priv(net); | |
147 | ||
148 | strncpy(info->driver, dev->driver_name, sizeof(info->driver)); | |
149 | strncpy(info->version, DRIVER_VERSION, sizeof(info->version)); | |
150 | strncpy(info->fw_version, dev->driver_info->description, | |
151 | sizeof(info->fw_version)); | |
152 | usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info)); | |
153 | } | |
154 | ||
900d495a AO |
155 | static u8 cdc_ncm_setup(struct cdc_ncm_ctx *ctx) |
156 | { | |
900d495a | 157 | u32 val; |
900d495a AO |
158 | u8 flags; |
159 | u8 iface_no; | |
160 | int err; | |
84e77a8b | 161 | u16 ntb_fmt_supported; |
900d495a AO |
162 | |
163 | iface_no = ctx->control->cur_altsetting->desc.bInterfaceNumber; | |
164 | ||
36c35416 GS |
165 | err = usb_control_msg(ctx->udev, |
166 | usb_rcvctrlpipe(ctx->udev, 0), | |
167 | USB_CDC_GET_NTB_PARAMETERS, | |
168 | USB_TYPE_CLASS | USB_DIR_IN | |
169 | | USB_RECIP_INTERFACE, | |
170 | 0, iface_no, &ctx->ncm_parm, | |
171 | sizeof(ctx->ncm_parm), 10000); | |
172 | if (err < 0) { | |
900d495a AO |
173 | pr_debug("failed GET_NTB_PARAMETERS\n"); |
174 | return 1; | |
175 | } | |
176 | ||
177 | /* read correct set of parameters according to device mode */ | |
178 | ctx->rx_max = le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize); | |
179 | ctx->tx_max = le32_to_cpu(ctx->ncm_parm.dwNtbOutMaxSize); | |
180 | ctx->tx_remainder = le16_to_cpu(ctx->ncm_parm.wNdpOutPayloadRemainder); | |
181 | ctx->tx_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutDivisor); | |
182 | ctx->tx_ndp_modulus = le16_to_cpu(ctx->ncm_parm.wNdpOutAlignment); | |
84e77a8b AO |
183 | /* devices prior to NCM Errata shall set this field to zero */ |
184 | ctx->tx_max_datagrams = le16_to_cpu(ctx->ncm_parm.wNtbOutMaxDatagrams); | |
185 | ntb_fmt_supported = le16_to_cpu(ctx->ncm_parm.bmNtbFormatsSupported); | |
900d495a AO |
186 | |
187 | if (ctx->func_desc != NULL) | |
188 | flags = ctx->func_desc->bmNetworkCapabilities; | |
189 | else | |
190 | flags = 0; | |
191 | ||
192 | pr_debug("dwNtbInMaxSize=%u dwNtbOutMaxSize=%u " | |
193 | "wNdpOutPayloadRemainder=%u wNdpOutDivisor=%u " | |
84e77a8b | 194 | "wNdpOutAlignment=%u wNtbOutMaxDatagrams=%u flags=0x%x\n", |
900d495a | 195 | ctx->rx_max, ctx->tx_max, ctx->tx_remainder, ctx->tx_modulus, |
84e77a8b | 196 | ctx->tx_ndp_modulus, ctx->tx_max_datagrams, flags); |
900d495a | 197 | |
84e77a8b AO |
198 | /* max count of tx datagrams */ |
199 | if ((ctx->tx_max_datagrams == 0) || | |
200 | (ctx->tx_max_datagrams > CDC_NCM_DPT_DATAGRAMS_MAX)) | |
201 | ctx->tx_max_datagrams = CDC_NCM_DPT_DATAGRAMS_MAX; | |
900d495a AO |
202 | |
203 | /* verify maximum size of received NTB in bytes */ | |
84e77a8b AO |
204 | if (ctx->rx_max < USB_CDC_NCM_NTB_MIN_IN_SIZE) { |
205 | pr_debug("Using min receive length=%d\n", | |
206 | USB_CDC_NCM_NTB_MIN_IN_SIZE); | |
207 | ctx->rx_max = USB_CDC_NCM_NTB_MIN_IN_SIZE; | |
208 | } | |
209 | ||
210 | if (ctx->rx_max > CDC_NCM_NTB_MAX_SIZE_RX) { | |
900d495a AO |
211 | pr_debug("Using default maximum receive length=%d\n", |
212 | CDC_NCM_NTB_MAX_SIZE_RX); | |
213 | ctx->rx_max = CDC_NCM_NTB_MAX_SIZE_RX; | |
214 | } | |
215 | ||
84e77a8b AO |
216 | /* inform device about NTB input size changes */ |
217 | if (ctx->rx_max != le32_to_cpu(ctx->ncm_parm.dwNtbInMaxSize)) { | |
84e77a8b AO |
218 | |
219 | if (flags & USB_CDC_NCM_NCAP_NTB_INPUT_SIZE) { | |
75bc8ef5 JB |
220 | struct usb_cdc_ncm_ndp_input_size *ndp_in_sz; |
221 | ||
222 | ndp_in_sz = kzalloc(sizeof(*ndp_in_sz), GFP_KERNEL); | |
223 | if (!ndp_in_sz) { | |
224 | err = -ENOMEM; | |
225 | goto size_err; | |
226 | } | |
227 | ||
36c35416 GS |
228 | err = usb_control_msg(ctx->udev, |
229 | usb_sndctrlpipe(ctx->udev, 0), | |
230 | USB_CDC_SET_NTB_INPUT_SIZE, | |
231 | USB_TYPE_CLASS | USB_DIR_OUT | |
232 | | USB_RECIP_INTERFACE, | |
75bc8ef5 JB |
233 | 0, iface_no, ndp_in_sz, 8, 1000); |
234 | kfree(ndp_in_sz); | |
84e77a8b | 235 | } else { |
75bc8ef5 JB |
236 | __le32 *dwNtbInMaxSize; |
237 | dwNtbInMaxSize = kzalloc(sizeof(*dwNtbInMaxSize), | |
238 | GFP_KERNEL); | |
239 | if (!dwNtbInMaxSize) { | |
240 | err = -ENOMEM; | |
241 | goto size_err; | |
242 | } | |
243 | *dwNtbInMaxSize = cpu_to_le32(ctx->rx_max); | |
244 | ||
36c35416 GS |
245 | err = usb_control_msg(ctx->udev, |
246 | usb_sndctrlpipe(ctx->udev, 0), | |
247 | USB_CDC_SET_NTB_INPUT_SIZE, | |
248 | USB_TYPE_CLASS | USB_DIR_OUT | |
249 | | USB_RECIP_INTERFACE, | |
75bc8ef5 JB |
250 | 0, iface_no, dwNtbInMaxSize, 4, 1000); |
251 | kfree(dwNtbInMaxSize); | |
84e77a8b | 252 | } |
75bc8ef5 | 253 | size_err: |
36c35416 | 254 | if (err < 0) |
84e77a8b AO |
255 | pr_debug("Setting NTB Input Size failed\n"); |
256 | } | |
257 | ||
900d495a AO |
258 | /* verify maximum size of transmitted NTB in bytes */ |
259 | if ((ctx->tx_max < | |
260 | (CDC_NCM_MIN_HDR_SIZE + CDC_NCM_MIN_DATAGRAM_SIZE)) || | |
261 | (ctx->tx_max > CDC_NCM_NTB_MAX_SIZE_TX)) { | |
262 | pr_debug("Using default maximum transmit length=%d\n", | |
263 | CDC_NCM_NTB_MAX_SIZE_TX); | |
264 | ctx->tx_max = CDC_NCM_NTB_MAX_SIZE_TX; | |
265 | } | |
266 | ||
267 | /* | |
268 | * verify that the structure alignment is: | |
269 | * - power of two | |
270 | * - not greater than the maximum transmit length | |
271 | * - not less than four bytes | |
272 | */ | |
273 | val = ctx->tx_ndp_modulus; | |
274 | ||
275 | if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || | |
276 | (val != ((-val) & val)) || (val >= ctx->tx_max)) { | |
277 | pr_debug("Using default alignment: 4 bytes\n"); | |
278 | ctx->tx_ndp_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; | |
279 | } | |
280 | ||
281 | /* | |
282 | * verify that the payload alignment is: | |
283 | * - power of two | |
284 | * - not greater than the maximum transmit length | |
285 | * - not less than four bytes | |
286 | */ | |
287 | val = ctx->tx_modulus; | |
288 | ||
289 | if ((val < USB_CDC_NCM_NDP_ALIGN_MIN_SIZE) || | |
290 | (val != ((-val) & val)) || (val >= ctx->tx_max)) { | |
291 | pr_debug("Using default transmit modulus: 4 bytes\n"); | |
292 | ctx->tx_modulus = USB_CDC_NCM_NDP_ALIGN_MIN_SIZE; | |
293 | } | |
294 | ||
295 | /* verify the payload remainder */ | |
296 | if (ctx->tx_remainder >= ctx->tx_modulus) { | |
297 | pr_debug("Using default transmit remainder: 0 bytes\n"); | |
298 | ctx->tx_remainder = 0; | |
299 | } | |
300 | ||
301 | /* adjust TX-remainder according to NCM specification. */ | |
302 | ctx->tx_remainder = ((ctx->tx_remainder - ETH_HLEN) & | |
303 | (ctx->tx_modulus - 1)); | |
304 | ||
305 | /* additional configuration */ | |
306 | ||
307 | /* set CRC Mode */ | |
84e77a8b | 308 | if (flags & USB_CDC_NCM_NCAP_CRC_MODE) { |
36c35416 GS |
309 | err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), |
310 | USB_CDC_SET_CRC_MODE, | |
311 | USB_TYPE_CLASS | USB_DIR_OUT | |
312 | | USB_RECIP_INTERFACE, | |
313 | USB_CDC_NCM_CRC_NOT_APPENDED, | |
314 | iface_no, NULL, 0, 1000); | |
315 | if (err < 0) | |
84e77a8b AO |
316 | pr_debug("Setting CRC mode off failed\n"); |
317 | } | |
900d495a | 318 | |
84e77a8b AO |
319 | /* set NTB format, if both formats are supported */ |
320 | if (ntb_fmt_supported & USB_CDC_NCM_NTH32_SIGN) { | |
36c35416 GS |
321 | err = usb_control_msg(ctx->udev, usb_sndctrlpipe(ctx->udev, 0), |
322 | USB_CDC_SET_NTB_FORMAT, USB_TYPE_CLASS | |
323 | | USB_DIR_OUT | USB_RECIP_INTERFACE, | |
324 | USB_CDC_NCM_NTB16_FORMAT, | |
325 | iface_no, NULL, 0, 1000); | |
326 | if (err < 0) | |
84e77a8b AO |
327 | pr_debug("Setting NTB format to 16-bit failed\n"); |
328 | } | |
900d495a | 329 | |
84e77a8b | 330 | ctx->max_datagram_size = CDC_NCM_MIN_DATAGRAM_SIZE; |
900d495a AO |
331 | |
332 | /* set Max Datagram Size (MTU) */ | |
84e77a8b | 333 | if (flags & USB_CDC_NCM_NCAP_MAX_DATAGRAM_SIZE) { |
75bc8ef5 | 334 | __le16 *max_datagram_size; |
84e77a8b | 335 | u16 eth_max_sz = le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); |
75bc8ef5 JB |
336 | |
337 | max_datagram_size = kzalloc(sizeof(*max_datagram_size), | |
338 | GFP_KERNEL); | |
339 | if (!max_datagram_size) { | |
340 | err = -ENOMEM; | |
341 | goto max_dgram_err; | |
342 | } | |
343 | ||
36c35416 GS |
344 | err = usb_control_msg(ctx->udev, usb_rcvctrlpipe(ctx->udev, 0), |
345 | USB_CDC_GET_MAX_DATAGRAM_SIZE, | |
346 | USB_TYPE_CLASS | USB_DIR_IN | |
347 | | USB_RECIP_INTERFACE, | |
75bc8ef5 | 348 | 0, iface_no, max_datagram_size, |
36c35416 GS |
349 | 2, 1000); |
350 | if (err < 0) { | |
84e77a8b AO |
351 | pr_debug("GET_MAX_DATAGRAM_SIZE failed, use size=%u\n", |
352 | CDC_NCM_MIN_DATAGRAM_SIZE); | |
353 | } else { | |
75bc8ef5 JB |
354 | ctx->max_datagram_size = |
355 | le16_to_cpu(*max_datagram_size); | |
84e77a8b | 356 | /* Check Eth descriptor value */ |
3f658cde | 357 | if (ctx->max_datagram_size > eth_max_sz) |
84e77a8b | 358 | ctx->max_datagram_size = eth_max_sz; |
3f658cde AO |
359 | |
360 | if (ctx->max_datagram_size > CDC_NCM_MAX_DATAGRAM_SIZE) | |
361 | ctx->max_datagram_size = | |
84e77a8b | 362 | CDC_NCM_MAX_DATAGRAM_SIZE; |
900d495a | 363 | |
84e77a8b AO |
364 | if (ctx->max_datagram_size < CDC_NCM_MIN_DATAGRAM_SIZE) |
365 | ctx->max_datagram_size = | |
366 | CDC_NCM_MIN_DATAGRAM_SIZE; | |
367 | ||
368 | /* if value changed, update device */ | |
3f658cde AO |
369 | if (ctx->max_datagram_size != |
370 | le16_to_cpu(*max_datagram_size)) { | |
371 | err = usb_control_msg(ctx->udev, | |
36c35416 GS |
372 | usb_sndctrlpipe(ctx->udev, 0), |
373 | USB_CDC_SET_MAX_DATAGRAM_SIZE, | |
374 | USB_TYPE_CLASS | USB_DIR_OUT | |
375 | | USB_RECIP_INTERFACE, | |
376 | 0, | |
75bc8ef5 | 377 | iface_no, max_datagram_size, |
36c35416 | 378 | 2, 1000); |
3f658cde AO |
379 | if (err < 0) |
380 | pr_debug("SET_MAX_DGRAM_SIZE failed\n"); | |
381 | } | |
84e77a8b | 382 | } |
3f658cde | 383 | kfree(max_datagram_size); |
900d495a AO |
384 | } |
385 | ||
3f658cde | 386 | max_dgram_err: |
900d495a AO |
387 | if (ctx->netdev->mtu != (ctx->max_datagram_size - ETH_HLEN)) |
388 | ctx->netdev->mtu = ctx->max_datagram_size - ETH_HLEN; | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | static void | |
394 | cdc_ncm_find_endpoints(struct cdc_ncm_ctx *ctx, struct usb_interface *intf) | |
395 | { | |
396 | struct usb_host_endpoint *e; | |
397 | u8 ep; | |
398 | ||
399 | for (ep = 0; ep < intf->cur_altsetting->desc.bNumEndpoints; ep++) { | |
400 | ||
401 | e = intf->cur_altsetting->endpoint + ep; | |
402 | switch (e->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { | |
403 | case USB_ENDPOINT_XFER_INT: | |
404 | if (usb_endpoint_dir_in(&e->desc)) { | |
405 | if (ctx->status_ep == NULL) | |
406 | ctx->status_ep = e; | |
407 | } | |
408 | break; | |
409 | ||
410 | case USB_ENDPOINT_XFER_BULK: | |
411 | if (usb_endpoint_dir_in(&e->desc)) { | |
412 | if (ctx->in_ep == NULL) | |
413 | ctx->in_ep = e; | |
414 | } else { | |
415 | if (ctx->out_ep == NULL) | |
416 | ctx->out_ep = e; | |
417 | } | |
418 | break; | |
419 | ||
420 | default: | |
421 | break; | |
422 | } | |
423 | } | |
424 | } | |
425 | ||
426 | static void cdc_ncm_free(struct cdc_ncm_ctx *ctx) | |
427 | { | |
428 | if (ctx == NULL) | |
429 | return; | |
430 | ||
900d495a AO |
431 | if (ctx->tx_rem_skb != NULL) { |
432 | dev_kfree_skb_any(ctx->tx_rem_skb); | |
433 | ctx->tx_rem_skb = NULL; | |
434 | } | |
435 | ||
436 | if (ctx->tx_curr_skb != NULL) { | |
437 | dev_kfree_skb_any(ctx->tx_curr_skb); | |
438 | ctx->tx_curr_skb = NULL; | |
439 | } | |
440 | ||
441 | kfree(ctx); | |
442 | } | |
443 | ||
f94898ea DW |
444 | static const struct ethtool_ops cdc_ncm_ethtool_ops = { |
445 | .get_drvinfo = cdc_ncm_get_drvinfo, | |
446 | .get_link = usbnet_get_link, | |
447 | .get_msglevel = usbnet_get_msglevel, | |
448 | .set_msglevel = usbnet_set_msglevel, | |
449 | .get_settings = usbnet_get_settings, | |
450 | .set_settings = usbnet_set_settings, | |
451 | .nway_reset = usbnet_nway_reset, | |
452 | }; | |
453 | ||
900d495a AO |
454 | static int cdc_ncm_bind(struct usbnet *dev, struct usb_interface *intf) |
455 | { | |
456 | struct cdc_ncm_ctx *ctx; | |
457 | struct usb_driver *driver; | |
458 | u8 *buf; | |
459 | int len; | |
460 | int temp; | |
461 | u8 iface_no; | |
462 | ||
c796984f | 463 | ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
900d495a | 464 | if (ctx == NULL) |
19694ac8 | 465 | return -ENODEV; |
900d495a | 466 | |
c84ff1d6 AO |
467 | hrtimer_init(&ctx->tx_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); |
468 | ctx->tx_timer.function = &cdc_ncm_tx_timer_cb; | |
469 | ctx->bh.data = (unsigned long)ctx; | |
470 | ctx->bh.func = cdc_ncm_txpath_bh; | |
471 | atomic_set(&ctx->stop, 0); | |
900d495a AO |
472 | spin_lock_init(&ctx->mtx); |
473 | ctx->netdev = dev->net; | |
474 | ||
475 | /* store ctx pointer in device data field */ | |
476 | dev->data[0] = (unsigned long)ctx; | |
477 | ||
478 | /* get some pointers */ | |
479 | driver = driver_of(intf); | |
480 | buf = intf->cur_altsetting->extra; | |
481 | len = intf->cur_altsetting->extralen; | |
482 | ||
483 | ctx->udev = dev->udev; | |
484 | ctx->intf = intf; | |
485 | ||
486 | /* parse through descriptors associated with control interface */ | |
487 | while ((len > 0) && (buf[0] > 2) && (buf[0] <= len)) { | |
488 | ||
489 | if (buf[1] != USB_DT_CS_INTERFACE) | |
490 | goto advance; | |
491 | ||
492 | switch (buf[2]) { | |
493 | case USB_CDC_UNION_TYPE: | |
494 | if (buf[0] < sizeof(*(ctx->union_desc))) | |
495 | break; | |
496 | ||
497 | ctx->union_desc = | |
498 | (const struct usb_cdc_union_desc *)buf; | |
499 | ||
500 | ctx->control = usb_ifnum_to_if(dev->udev, | |
501 | ctx->union_desc->bMasterInterface0); | |
502 | ctx->data = usb_ifnum_to_if(dev->udev, | |
503 | ctx->union_desc->bSlaveInterface0); | |
504 | break; | |
505 | ||
506 | case USB_CDC_ETHERNET_TYPE: | |
507 | if (buf[0] < sizeof(*(ctx->ether_desc))) | |
508 | break; | |
509 | ||
510 | ctx->ether_desc = | |
511 | (const struct usb_cdc_ether_desc *)buf; | |
900d495a AO |
512 | dev->hard_mtu = |
513 | le16_to_cpu(ctx->ether_desc->wMaxSegmentSize); | |
514 | ||
84e77a8b AO |
515 | if (dev->hard_mtu < CDC_NCM_MIN_DATAGRAM_SIZE) |
516 | dev->hard_mtu = CDC_NCM_MIN_DATAGRAM_SIZE; | |
517 | else if (dev->hard_mtu > CDC_NCM_MAX_DATAGRAM_SIZE) | |
518 | dev->hard_mtu = CDC_NCM_MAX_DATAGRAM_SIZE; | |
900d495a AO |
519 | break; |
520 | ||
521 | case USB_CDC_NCM_TYPE: | |
522 | if (buf[0] < sizeof(*(ctx->func_desc))) | |
523 | break; | |
524 | ||
525 | ctx->func_desc = (const struct usb_cdc_ncm_desc *)buf; | |
526 | break; | |
527 | ||
528 | default: | |
529 | break; | |
530 | } | |
531 | advance: | |
532 | /* advance to next descriptor */ | |
533 | temp = buf[0]; | |
534 | buf += temp; | |
535 | len -= temp; | |
536 | } | |
537 | ||
538 | /* check if we got everything */ | |
539 | if ((ctx->control == NULL) || (ctx->data == NULL) || | |
19694ac8 | 540 | (ctx->ether_desc == NULL) || (ctx->control != intf)) |
900d495a AO |
541 | goto error; |
542 | ||
543 | /* claim interfaces, if any */ | |
19694ac8 AO |
544 | temp = usb_driver_claim_interface(driver, ctx->data, dev); |
545 | if (temp) | |
546 | goto error; | |
900d495a AO |
547 | |
548 | iface_no = ctx->data->cur_altsetting->desc.bInterfaceNumber; | |
549 | ||
550 | /* reset data interface */ | |
551 | temp = usb_set_interface(dev->udev, iface_no, 0); | |
552 | if (temp) | |
19694ac8 | 553 | goto error2; |
900d495a AO |
554 | |
555 | /* initialize data interface */ | |
556 | if (cdc_ncm_setup(ctx)) | |
19694ac8 | 557 | goto error2; |
900d495a AO |
558 | |
559 | /* configure data interface */ | |
560 | temp = usb_set_interface(dev->udev, iface_no, 1); | |
561 | if (temp) | |
19694ac8 | 562 | goto error2; |
900d495a AO |
563 | |
564 | cdc_ncm_find_endpoints(ctx, ctx->data); | |
565 | cdc_ncm_find_endpoints(ctx, ctx->control); | |
566 | ||
567 | if ((ctx->in_ep == NULL) || (ctx->out_ep == NULL) || | |
568 | (ctx->status_ep == NULL)) | |
19694ac8 | 569 | goto error2; |
900d495a AO |
570 | |
571 | dev->net->ethtool_ops = &cdc_ncm_ethtool_ops; | |
572 | ||
573 | usb_set_intfdata(ctx->data, dev); | |
574 | usb_set_intfdata(ctx->control, dev); | |
575 | usb_set_intfdata(ctx->intf, dev); | |
576 | ||
577 | temp = usbnet_get_ethernet_addr(dev, ctx->ether_desc->iMACAddress); | |
578 | if (temp) | |
19694ac8 | 579 | goto error2; |
900d495a | 580 | |
517cd81c | 581 | dev_info(&dev->udev->dev, "MAC-Address: %pM\n", dev->net->dev_addr); |
900d495a AO |
582 | |
583 | dev->in = usb_rcvbulkpipe(dev->udev, | |
584 | ctx->in_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
585 | dev->out = usb_sndbulkpipe(dev->udev, | |
586 | ctx->out_ep->desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK); | |
587 | dev->status = ctx->status_ep; | |
588 | dev->rx_urb_size = ctx->rx_max; | |
589 | ||
590 | /* | |
591 | * We should get an event when network connection is "connected" or | |
592 | * "disconnected". Set network connection in "disconnected" state | |
593 | * (carrier is OFF) during attach, so the IP network stack does not | |
594 | * start IPv6 negotiation and more. | |
595 | */ | |
596 | netif_carrier_off(dev->net); | |
597 | ctx->tx_speed = ctx->rx_speed = 0; | |
598 | return 0; | |
599 | ||
19694ac8 AO |
600 | error2: |
601 | usb_set_intfdata(ctx->control, NULL); | |
602 | usb_set_intfdata(ctx->data, NULL); | |
603 | usb_driver_release_interface(driver, ctx->data); | |
900d495a AO |
604 | error: |
605 | cdc_ncm_free((struct cdc_ncm_ctx *)dev->data[0]); | |
606 | dev->data[0] = 0; | |
19694ac8 | 607 | dev_info(&dev->udev->dev, "bind() failure\n"); |
900d495a AO |
608 | return -ENODEV; |
609 | } | |
610 | ||
611 | static void cdc_ncm_unbind(struct usbnet *dev, struct usb_interface *intf) | |
612 | { | |
613 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
19694ac8 | 614 | struct usb_driver *driver = driver_of(intf); |
900d495a AO |
615 | |
616 | if (ctx == NULL) | |
617 | return; /* no setup */ | |
618 | ||
c84ff1d6 AO |
619 | atomic_set(&ctx->stop, 1); |
620 | ||
621 | if (hrtimer_active(&ctx->tx_timer)) | |
622 | hrtimer_cancel(&ctx->tx_timer); | |
623 | ||
624 | tasklet_kill(&ctx->bh); | |
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) | |
c84ff1d6 | 796 | ctx->tx_timer_pending = CDC_NCM_TIMER_PENDING_CNT; |
900d495a AO |
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; | |
c84ff1d6 | 876 | ctx->netdev->stats.tx_packets += ctx->tx_curr_frame_num; |
900d495a AO |
877 | return skb_out; |
878 | ||
879 | exit_no_skb: | |
c84ff1d6 AO |
880 | /* Start timer, if there is a remaining skb */ |
881 | if (ctx->tx_curr_skb != NULL) | |
882 | cdc_ncm_tx_timeout_start(ctx); | |
900d495a AO |
883 | return NULL; |
884 | } | |
885 | ||
886 | static void cdc_ncm_tx_timeout_start(struct cdc_ncm_ctx *ctx) | |
887 | { | |
888 | /* start timer, if not already started */ | |
c84ff1d6 AO |
889 | if (!(hrtimer_active(&ctx->tx_timer) || atomic_read(&ctx->stop))) |
890 | hrtimer_start(&ctx->tx_timer, | |
891 | ktime_set(0, CDC_NCM_TIMER_INTERVAL), | |
892 | HRTIMER_MODE_REL); | |
900d495a AO |
893 | } |
894 | ||
c84ff1d6 | 895 | static enum hrtimer_restart cdc_ncm_tx_timer_cb(struct hrtimer *timer) |
900d495a | 896 | { |
c84ff1d6 AO |
897 | struct cdc_ncm_ctx *ctx = |
898 | container_of(timer, struct cdc_ncm_ctx, tx_timer); | |
900d495a | 899 | |
c84ff1d6 AO |
900 | if (!atomic_read(&ctx->stop)) |
901 | tasklet_schedule(&ctx->bh); | |
902 | return HRTIMER_NORESTART; | |
903 | } | |
900d495a | 904 | |
c84ff1d6 AO |
905 | static void cdc_ncm_txpath_bh(unsigned long param) |
906 | { | |
907 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)param; | |
900d495a | 908 | |
c84ff1d6 AO |
909 | spin_lock_bh(&ctx->mtx); |
910 | if (ctx->tx_timer_pending != 0) { | |
911 | ctx->tx_timer_pending--; | |
900d495a | 912 | cdc_ncm_tx_timeout_start(ctx); |
c84ff1d6 | 913 | spin_unlock_bh(&ctx->mtx); |
f742aa8a | 914 | } else if (ctx->netdev != NULL) { |
c84ff1d6 AO |
915 | spin_unlock_bh(&ctx->mtx); |
916 | netif_tx_lock_bh(ctx->netdev); | |
900d495a | 917 | usbnet_start_xmit(NULL, ctx->netdev); |
c84ff1d6 | 918 | netif_tx_unlock_bh(ctx->netdev); |
f742aa8a | 919 | } |
900d495a AO |
920 | } |
921 | ||
922 | static struct sk_buff * | |
923 | cdc_ncm_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags) | |
924 | { | |
925 | struct sk_buff *skb_out; | |
926 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
900d495a AO |
927 | |
928 | /* | |
929 | * The Ethernet API we are using does not support transmitting | |
930 | * multiple Ethernet frames in a single call. This driver will | |
931 | * accumulate multiple Ethernet frames and send out a larger | |
932 | * USB frame when the USB buffer is full or when a single jiffies | |
933 | * timeout happens. | |
934 | */ | |
935 | if (ctx == NULL) | |
936 | goto error; | |
937 | ||
c84ff1d6 | 938 | spin_lock_bh(&ctx->mtx); |
900d495a | 939 | skb_out = cdc_ncm_fill_tx_frame(ctx, skb); |
c84ff1d6 | 940 | spin_unlock_bh(&ctx->mtx); |
900d495a AO |
941 | return skb_out; |
942 | ||
943 | error: | |
944 | if (skb != NULL) | |
945 | dev_kfree_skb_any(skb); | |
946 | ||
947 | return NULL; | |
948 | } | |
949 | ||
950 | static int cdc_ncm_rx_fixup(struct usbnet *dev, struct sk_buff *skb_in) | |
951 | { | |
952 | struct sk_buff *skb; | |
d5ddb4a5 AO |
953 | struct cdc_ncm_ctx *ctx = (struct cdc_ncm_ctx *)dev->data[0]; |
954 | int len; | |
900d495a AO |
955 | int nframes; |
956 | int x; | |
957 | int offset; | |
d5ddb4a5 AO |
958 | struct usb_cdc_ncm_nth16 *nth16; |
959 | struct usb_cdc_ncm_ndp16 *ndp16; | |
960 | struct usb_cdc_ncm_dpe16 *dpe16; | |
900d495a | 961 | |
900d495a AO |
962 | if (ctx == NULL) |
963 | goto error; | |
964 | ||
d5ddb4a5 AO |
965 | if (skb_in->len < (sizeof(struct usb_cdc_ncm_nth16) + |
966 | sizeof(struct usb_cdc_ncm_ndp16))) { | |
900d495a AO |
967 | pr_debug("frame too short\n"); |
968 | goto error; | |
969 | } | |
970 | ||
d5ddb4a5 | 971 | nth16 = (struct usb_cdc_ncm_nth16 *)skb_in->data; |
900d495a | 972 | |
d5ddb4a5 | 973 | if (le32_to_cpu(nth16->dwSignature) != USB_CDC_NCM_NTH16_SIGN) { |
900d495a | 974 | pr_debug("invalid NTH16 signature <%u>\n", |
d5ddb4a5 | 975 | le32_to_cpu(nth16->dwSignature)); |
900d495a AO |
976 | goto error; |
977 | } | |
978 | ||
d5ddb4a5 AO |
979 | len = le16_to_cpu(nth16->wBlockLength); |
980 | if (len > ctx->rx_max) { | |
981 | pr_debug("unsupported NTB block length %u/%u\n", len, | |
982 | ctx->rx_max); | |
900d495a AO |
983 | goto error; |
984 | } | |
985 | ||
d5ddb4a5 AO |
986 | if ((ctx->rx_seq + 1) != le16_to_cpu(nth16->wSequence) && |
987 | (ctx->rx_seq || le16_to_cpu(nth16->wSequence)) && | |
988 | !((ctx->rx_seq == 0xffff) && !le16_to_cpu(nth16->wSequence))) { | |
989 | pr_debug("sequence number glitch prev=%d curr=%d\n", | |
990 | ctx->rx_seq, le16_to_cpu(nth16->wSequence)); | |
991 | } | |
992 | ctx->rx_seq = le16_to_cpu(nth16->wSequence); | |
993 | ||
994 | len = le16_to_cpu(nth16->wNdpIndex); | |
995 | if ((len + sizeof(struct usb_cdc_ncm_ndp16)) > skb_in->len) { | |
996 | pr_debug("invalid DPT16 index <%u>\n", | |
997 | le16_to_cpu(nth16->wNdpIndex)); | |
900d495a AO |
998 | goto error; |
999 | } | |
1000 | ||
d5ddb4a5 | 1001 | ndp16 = (struct usb_cdc_ncm_ndp16 *)(((u8 *)skb_in->data) + len); |
900d495a | 1002 | |
d5ddb4a5 | 1003 | if (le32_to_cpu(ndp16->dwSignature) != USB_CDC_NCM_NDP16_NOCRC_SIGN) { |
900d495a | 1004 | pr_debug("invalid DPT16 signature <%u>\n", |
d5ddb4a5 | 1005 | le32_to_cpu(ndp16->dwSignature)); |
900d495a AO |
1006 | goto error; |
1007 | } | |
1008 | ||
d5ddb4a5 | 1009 | if (le16_to_cpu(ndp16->wLength) < USB_CDC_NCM_NDP16_LENGTH_MIN) { |
900d495a | 1010 | pr_debug("invalid DPT16 length <%u>\n", |
d5ddb4a5 | 1011 | le32_to_cpu(ndp16->dwSignature)); |
900d495a AO |
1012 | goto error; |
1013 | } | |
1014 | ||
d5ddb4a5 | 1015 | nframes = ((le16_to_cpu(ndp16->wLength) - |
900d495a AO |
1016 | sizeof(struct usb_cdc_ncm_ndp16)) / |
1017 | sizeof(struct usb_cdc_ncm_dpe16)); | |
1018 | nframes--; /* we process NDP entries except for the last one */ | |
1019 | ||
d5ddb4a5 | 1020 | len += sizeof(struct usb_cdc_ncm_ndp16); |
900d495a | 1021 | |
d5ddb4a5 AO |
1022 | if ((len + nframes * (sizeof(struct usb_cdc_ncm_dpe16))) > |
1023 | skb_in->len) { | |
900d495a AO |
1024 | pr_debug("Invalid nframes = %d\n", nframes); |
1025 | goto error; | |
1026 | } | |
1027 | ||
d5ddb4a5 | 1028 | dpe16 = (struct usb_cdc_ncm_dpe16 *)(((u8 *)skb_in->data) + len); |
900d495a | 1029 | |
d5ddb4a5 AO |
1030 | for (x = 0; x < nframes; x++, dpe16++) { |
1031 | offset = le16_to_cpu(dpe16->wDatagramIndex); | |
1032 | len = le16_to_cpu(dpe16->wDatagramLength); | |
900d495a AO |
1033 | |
1034 | /* | |
1035 | * CDC NCM ch. 3.7 | |
1036 | * All entries after first NULL entry are to be ignored | |
1037 | */ | |
d5ddb4a5 | 1038 | if ((offset == 0) || (len == 0)) { |
900d495a AO |
1039 | if (!x) |
1040 | goto error; /* empty NTB */ | |
1041 | break; | |
1042 | } | |
1043 | ||
1044 | /* sanity checking */ | |
d5ddb4a5 AO |
1045 | if (((offset + len) > skb_in->len) || |
1046 | (len > ctx->rx_max) || (len < ETH_HLEN)) { | |
900d495a | 1047 | pr_debug("invalid frame detected (ignored)" |
f742aa8a | 1048 | "offset[%u]=%u, length=%u, skb=%p\n", |
d5ddb4a5 | 1049 | x, offset, len, skb_in); |
900d495a AO |
1050 | if (!x) |
1051 | goto error; | |
1052 | break; | |
1053 | ||
1054 | } else { | |
1055 | skb = skb_clone(skb_in, GFP_ATOMIC); | |
9e56790a JJ |
1056 | if (!skb) |
1057 | goto error; | |
d5ddb4a5 | 1058 | skb->len = len; |
900d495a | 1059 | skb->data = ((u8 *)skb_in->data) + offset; |
d5ddb4a5 | 1060 | skb_set_tail_pointer(skb, len); |
900d495a AO |
1061 | usbnet_skb_return(dev, skb); |
1062 | } | |
1063 | } | |
1064 | return 1; | |
1065 | error: | |
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | static void | |
1070 | cdc_ncm_speed_change(struct cdc_ncm_ctx *ctx, | |
84e77a8b | 1071 | struct usb_cdc_speed_change *data) |
900d495a | 1072 | { |
84e77a8b AO |
1073 | uint32_t rx_speed = le32_to_cpu(data->DLBitRRate); |
1074 | uint32_t tx_speed = le32_to_cpu(data->ULBitRate); | |
900d495a AO |
1075 | |
1076 | /* | |
1077 | * Currently the USB-NET API does not support reporting the actual | |
1078 | * device speed. Do print it instead. | |
1079 | */ | |
1080 | if ((tx_speed != ctx->tx_speed) || (rx_speed != ctx->rx_speed)) { | |
1081 | ctx->tx_speed = tx_speed; | |
1082 | ctx->rx_speed = rx_speed; | |
1083 | ||
1084 | if ((tx_speed > 1000000) && (rx_speed > 1000000)) { | |
1085 | printk(KERN_INFO KBUILD_MODNAME | |
1086 | ": %s: %u mbit/s downlink " | |
1087 | "%u mbit/s uplink\n", | |
1088 | ctx->netdev->name, | |
1089 | (unsigned int)(rx_speed / 1000000U), | |
1090 | (unsigned int)(tx_speed / 1000000U)); | |
1091 | } else { | |
1092 | printk(KERN_INFO KBUILD_MODNAME | |
1093 | ": %s: %u kbit/s downlink " | |
1094 | "%u kbit/s uplink\n", | |
1095 | ctx->netdev->name, | |
1096 | (unsigned int)(rx_speed / 1000U), | |
1097 | (unsigned int)(tx_speed / 1000U)); | |
1098 | } | |
1099 | } | |
1100 | } | |
1101 | ||
1102 | static void cdc_ncm_status(struct usbnet *dev, struct urb *urb) | |
1103 | { | |
1104 | struct cdc_ncm_ctx *ctx; | |
1105 | struct usb_cdc_notification *event; | |
1106 | ||
1107 | ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
1108 | ||
1109 | if (urb->actual_length < sizeof(*event)) | |
1110 | return; | |
1111 | ||
1112 | /* test for split data in 8-byte chunks */ | |
1113 | if (test_and_clear_bit(EVENT_STS_SPLIT, &dev->flags)) { | |
1114 | cdc_ncm_speed_change(ctx, | |
84e77a8b | 1115 | (struct usb_cdc_speed_change *)urb->transfer_buffer); |
900d495a AO |
1116 | return; |
1117 | } | |
1118 | ||
1119 | event = urb->transfer_buffer; | |
1120 | ||
1121 | switch (event->bNotificationType) { | |
1122 | case USB_CDC_NOTIFY_NETWORK_CONNECTION: | |
1123 | /* | |
1124 | * According to the CDC NCM specification ch.7.1 | |
1125 | * USB_CDC_NOTIFY_NETWORK_CONNECTION notification shall be | |
1126 | * sent by device after USB_CDC_NOTIFY_SPEED_CHANGE. | |
1127 | */ | |
1128 | ctx->connected = event->wValue; | |
1129 | ||
1130 | printk(KERN_INFO KBUILD_MODNAME ": %s: network connection:" | |
1131 | " %sconnected\n", | |
1132 | ctx->netdev->name, ctx->connected ? "" : "dis"); | |
1133 | ||
1134 | if (ctx->connected) | |
1135 | netif_carrier_on(dev->net); | |
1136 | else { | |
1137 | netif_carrier_off(dev->net); | |
1138 | ctx->tx_speed = ctx->rx_speed = 0; | |
1139 | } | |
1140 | break; | |
1141 | ||
1142 | case USB_CDC_NOTIFY_SPEED_CHANGE: | |
84e77a8b AO |
1143 | if (urb->actual_length < (sizeof(*event) + |
1144 | sizeof(struct usb_cdc_speed_change))) | |
900d495a AO |
1145 | set_bit(EVENT_STS_SPLIT, &dev->flags); |
1146 | else | |
1147 | cdc_ncm_speed_change(ctx, | |
84e77a8b | 1148 | (struct usb_cdc_speed_change *) &event[1]); |
900d495a AO |
1149 | break; |
1150 | ||
1151 | default: | |
1152 | dev_err(&dev->udev->dev, "NCM: unexpected " | |
1153 | "notification 0x%02x!\n", event->bNotificationType); | |
1154 | break; | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | static int cdc_ncm_check_connect(struct usbnet *dev) | |
1159 | { | |
1160 | struct cdc_ncm_ctx *ctx; | |
1161 | ||
1162 | ctx = (struct cdc_ncm_ctx *)dev->data[0]; | |
1163 | if (ctx == NULL) | |
1164 | return 1; /* disconnected */ | |
1165 | ||
1166 | return !ctx->connected; | |
1167 | } | |
1168 | ||
1169 | static int | |
1170 | cdc_ncm_probe(struct usb_interface *udev, const struct usb_device_id *prod) | |
1171 | { | |
1172 | return usbnet_probe(udev, prod); | |
1173 | } | |
1174 | ||
1175 | static void cdc_ncm_disconnect(struct usb_interface *intf) | |
1176 | { | |
1177 | struct usbnet *dev = usb_get_intfdata(intf); | |
1178 | ||
1179 | if (dev == NULL) | |
1180 | return; /* already disconnected */ | |
1181 | ||
1182 | usbnet_disconnect(intf); | |
1183 | } | |
1184 | ||
1185 | static int cdc_ncm_manage_power(struct usbnet *dev, int status) | |
1186 | { | |
1187 | dev->intf->needs_remote_wakeup = status; | |
1188 | return 0; | |
1189 | } | |
1190 | ||
1191 | static const struct driver_info cdc_ncm_info = { | |
1192 | .description = "CDC NCM", | |
c261344d | 1193 | .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET, |
900d495a AO |
1194 | .bind = cdc_ncm_bind, |
1195 | .unbind = cdc_ncm_unbind, | |
1196 | .check_connect = cdc_ncm_check_connect, | |
1197 | .manage_power = cdc_ncm_manage_power, | |
1198 | .status = cdc_ncm_status, | |
1199 | .rx_fixup = cdc_ncm_rx_fixup, | |
1200 | .tx_fixup = cdc_ncm_tx_fixup, | |
1201 | }; | |
1202 | ||
f94898ea DW |
1203 | /* Same as cdc_ncm_info, but with FLAG_WWAN */ |
1204 | static const struct driver_info wwan_info = { | |
1205 | .description = "Mobile Broadband Network Device", | |
1206 | .flags = FLAG_POINTTOPOINT | FLAG_NO_SETINT | FLAG_MULTI_PACKET | |
1207 | | FLAG_WWAN, | |
1208 | .bind = cdc_ncm_bind, | |
1209 | .unbind = cdc_ncm_unbind, | |
1210 | .check_connect = cdc_ncm_check_connect, | |
1211 | .manage_power = cdc_ncm_manage_power, | |
1212 | .status = cdc_ncm_status, | |
1213 | .rx_fixup = cdc_ncm_rx_fixup, | |
1214 | .tx_fixup = cdc_ncm_tx_fixup, | |
1215 | }; | |
1216 | ||
1217 | static const struct usb_device_id cdc_devs[] = { | |
1218 | /* Ericsson MBM devices like F5521gw */ | |
1219 | { .match_flags = USB_DEVICE_ID_MATCH_INT_INFO | |
1220 | | USB_DEVICE_ID_MATCH_VENDOR, | |
1221 | .idVendor = 0x0bdb, | |
1222 | .bInterfaceClass = USB_CLASS_COMM, | |
1223 | .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM, | |
1224 | .bInterfaceProtocol = USB_CDC_PROTO_NONE, | |
1225 | .driver_info = (unsigned long) &wwan_info, | |
1226 | }, | |
1227 | ||
1228 | /* Generic CDC-NCM devices */ | |
1229 | { USB_INTERFACE_INFO(USB_CLASS_COMM, | |
1230 | USB_CDC_SUBCLASS_NCM, USB_CDC_PROTO_NONE), | |
1231 | .driver_info = (unsigned long)&cdc_ncm_info, | |
1232 | }, | |
1233 | { | |
1234 | }, | |
1235 | }; | |
1236 | MODULE_DEVICE_TABLE(usb, cdc_devs); | |
1237 | ||
900d495a AO |
1238 | static struct usb_driver cdc_ncm_driver = { |
1239 | .name = "cdc_ncm", | |
1240 | .id_table = cdc_devs, | |
1241 | .probe = cdc_ncm_probe, | |
1242 | .disconnect = cdc_ncm_disconnect, | |
1243 | .suspend = usbnet_suspend, | |
1244 | .resume = usbnet_resume, | |
85e3c65f | 1245 | .reset_resume = usbnet_resume, |
900d495a | 1246 | .supports_autosuspend = 1, |
e1f12eb6 | 1247 | .disable_hub_initiated_lpm = 1, |
900d495a AO |
1248 | }; |
1249 | ||
d632eb1b | 1250 | module_usb_driver(cdc_ncm_driver); |
900d495a AO |
1251 | |
1252 | MODULE_AUTHOR("Hans Petter Selasky"); | |
1253 | MODULE_DESCRIPTION("USB CDC NCM host driver"); | |
1254 | MODULE_LICENSE("Dual BSD/GPL"); |