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NFC: microread: Auto-select core module
[linux-2.6/btrfs-unstable.git] / drivers / usb / gadget / function / f_ncm.c
blob3f05c6bd57f0c3353b5a2973a3e344593834b5b5
1 /*
2 * f_ncm.c -- USB CDC Network (NCM) link function driver
3 *
4 * Copyright (C) 2010 Nokia Corporation
5 * Contact: Yauheni Kaliuta <yauheni.kaliuta@nokia.com>
6 *
7 * The driver borrows from f_ecm.c which is:
8 *
9 * Copyright (C) 2003-2005,2008 David Brownell
10 * Copyright (C) 2008 Nokia Corporation
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
16 */
17
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/device.h>
21 #include <linux/etherdevice.h>
22 #include <linux/crc32.h>
23
24 #include <linux/usb/cdc.h>
25
26 #include "u_ether.h"
27 #include "u_ether_configfs.h"
28 #include "u_ncm.h"
29
30 /*
31 * This function is a "CDC Network Control Model" (CDC NCM) Ethernet link.
32 * NCM is intended to be used with high-speed network attachments.
33 *
34 * Note that NCM requires the use of "alternate settings" for its data
35 * interface. This means that the set_alt() method has real work to do,
36 * and also means that a get_alt() method is required.
37 */
38
39 /* to trigger crc/non-crc ndp signature */
40
41 #define NCM_NDP_HDR_CRC_MASK 0x01000000
42 #define NCM_NDP_HDR_CRC 0x01000000
43 #define NCM_NDP_HDR_NOCRC 0x00000000
44
45 enum ncm_notify_state {
46 NCM_NOTIFY_NONE, /* don't notify */
47 NCM_NOTIFY_CONNECT, /* issue CONNECT next */
48 NCM_NOTIFY_SPEED, /* issue SPEED_CHANGE next */
49 };
50
51 struct f_ncm {
52 struct gether port;
53 u8 ctrl_id, data_id;
54
55 char ethaddr[14];
56
57 struct usb_ep *notify;
58 struct usb_request *notify_req;
59 u8 notify_state;
60 bool is_open;
61
62 const struct ndp_parser_opts *parser_opts;
63 bool is_crc;
64 u32 ndp_sign;
65
66 /*
67 * for notification, it is accessed from both
68 * callback and ethernet open/close
69 */
70 spinlock_t lock;
71
72 struct net_device *netdev;
73
74 /* For multi-frame NDP TX */
75 struct sk_buff *skb_tx_data;
76 struct sk_buff *skb_tx_ndp;
77 u16 ndp_dgram_count;
78 bool timer_force_tx;
79 struct tasklet_struct tx_tasklet;
80 struct hrtimer task_timer;
81
82 bool timer_stopping;
83 };
84
85 static inline struct f_ncm *func_to_ncm(struct usb_function *f)
86 {
87 return container_of(f, struct f_ncm, port.func);
88 }
89
90 /* peak (theoretical) bulk transfer rate in bits-per-second */
91 static inline unsigned ncm_bitrate(struct usb_gadget *g)
92 {
93 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
94 return 13 * 512 * 8 * 1000 * 8;
95 else
96 return 19 * 64 * 1 * 1000 * 8;
97 }
98
99 /*-------------------------------------------------------------------------*/
100
101 /*
102 * We cannot group frames so use just the minimal size which ok to put
103 * one max-size ethernet frame.
104 * If the host can group frames, allow it to do that, 16K is selected,
105 * because it's used by default by the current linux host driver
106 */
107 #define NTB_DEFAULT_IN_SIZE 16384
108 #define NTB_OUT_SIZE 16384
109
110 /* Allocation for storing the NDP, 32 should suffice for a
111 * 16k packet. This allows a maximum of 32 * 507 Byte packets to
112 * be transmitted in a single 16kB skb, though when sending full size
113 * packets this limit will be plenty.
114 * Smaller packets are not likely to be trying to maximize the
115 * throughput and will be mstly sending smaller infrequent frames.
116 */
117 #define TX_MAX_NUM_DPE 32
118
119 /* Delay for the transmit to wait before sending an unfilled NTB frame. */
120 #define TX_TIMEOUT_NSECS 300000
121
122 #define FORMATS_SUPPORTED (USB_CDC_NCM_NTB16_SUPPORTED | \
123 USB_CDC_NCM_NTB32_SUPPORTED)
124
125 static struct usb_cdc_ncm_ntb_parameters ntb_parameters = {
126 .wLength = cpu_to_le16(sizeof(ntb_parameters)),
127 .bmNtbFormatsSupported = cpu_to_le16(FORMATS_SUPPORTED),
128 .dwNtbInMaxSize = cpu_to_le32(NTB_DEFAULT_IN_SIZE),
129 .wNdpInDivisor = cpu_to_le16(4),
130 .wNdpInPayloadRemainder = cpu_to_le16(0),
131 .wNdpInAlignment = cpu_to_le16(4),
132
133 .dwNtbOutMaxSize = cpu_to_le32(NTB_OUT_SIZE),
134 .wNdpOutDivisor = cpu_to_le16(4),
135 .wNdpOutPayloadRemainder = cpu_to_le16(0),
136 .wNdpOutAlignment = cpu_to_le16(4),
137 };
138
139 /*
140 * Use wMaxPacketSize big enough to fit CDC_NOTIFY_SPEED_CHANGE in one
141 * packet, to simplify cancellation; and a big transfer interval, to
142 * waste less bandwidth.
143 */
144
145 #define NCM_STATUS_INTERVAL_MS 32
146 #define NCM_STATUS_BYTECOUNT 16 /* 8 byte header + data */
147
148 static struct usb_interface_assoc_descriptor ncm_iad_desc = {
149 .bLength = sizeof ncm_iad_desc,
150 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
151
152 /* .bFirstInterface = DYNAMIC, */
153 .bInterfaceCount = 2, /* control + data */
154 .bFunctionClass = USB_CLASS_COMM,
155 .bFunctionSubClass = USB_CDC_SUBCLASS_NCM,
156 .bFunctionProtocol = USB_CDC_PROTO_NONE,
157 /* .iFunction = DYNAMIC */
158 };
159
160 /* interface descriptor: */
161
162 static struct usb_interface_descriptor ncm_control_intf = {
163 .bLength = sizeof ncm_control_intf,
164 .bDescriptorType = USB_DT_INTERFACE,
165
166 /* .bInterfaceNumber = DYNAMIC */
167 .bNumEndpoints = 1,
168 .bInterfaceClass = USB_CLASS_COMM,
169 .bInterfaceSubClass = USB_CDC_SUBCLASS_NCM,
170 .bInterfaceProtocol = USB_CDC_PROTO_NONE,
171 /* .iInterface = DYNAMIC */
172 };
173
174 static struct usb_cdc_header_desc ncm_header_desc = {
175 .bLength = sizeof ncm_header_desc,
176 .bDescriptorType = USB_DT_CS_INTERFACE,
177 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
178
179 .bcdCDC = cpu_to_le16(0x0110),
180 };
181
182 static struct usb_cdc_union_desc ncm_union_desc = {
183 .bLength = sizeof(ncm_union_desc),
184 .bDescriptorType = USB_DT_CS_INTERFACE,
185 .bDescriptorSubType = USB_CDC_UNION_TYPE,
186 /* .bMasterInterface0 = DYNAMIC */
187 /* .bSlaveInterface0 = DYNAMIC */
188 };
189
190 static struct usb_cdc_ether_desc ecm_desc = {
191 .bLength = sizeof ecm_desc,
192 .bDescriptorType = USB_DT_CS_INTERFACE,
193 .bDescriptorSubType = USB_CDC_ETHERNET_TYPE,
194
195 /* this descriptor actually adds value, surprise! */
196 /* .iMACAddress = DYNAMIC */
197 .bmEthernetStatistics = cpu_to_le32(0), /* no statistics */
198 .wMaxSegmentSize = cpu_to_le16(ETH_FRAME_LEN),
199 .wNumberMCFilters = cpu_to_le16(0),
200 .bNumberPowerFilters = 0,
201 };
202
203 #define NCAPS (USB_CDC_NCM_NCAP_ETH_FILTER | USB_CDC_NCM_NCAP_CRC_MODE)
204
205 static struct usb_cdc_ncm_desc ncm_desc = {
206 .bLength = sizeof ncm_desc,
207 .bDescriptorType = USB_DT_CS_INTERFACE,
208 .bDescriptorSubType = USB_CDC_NCM_TYPE,
209
210 .bcdNcmVersion = cpu_to_le16(0x0100),
211 /* can process SetEthernetPacketFilter */
212 .bmNetworkCapabilities = NCAPS,
213 };
214
215 /* the default data interface has no endpoints ... */
216
217 static struct usb_interface_descriptor ncm_data_nop_intf = {
218 .bLength = sizeof ncm_data_nop_intf,
219 .bDescriptorType = USB_DT_INTERFACE,
220
221 .bInterfaceNumber = 1,
222 .bAlternateSetting = 0,
223 .bNumEndpoints = 0,
224 .bInterfaceClass = USB_CLASS_CDC_DATA,
225 .bInterfaceSubClass = 0,
226 .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB,
227 /* .iInterface = DYNAMIC */
228 };
229
230 /* ... but the "real" data interface has two bulk endpoints */
231
232 static struct usb_interface_descriptor ncm_data_intf = {
233 .bLength = sizeof ncm_data_intf,
234 .bDescriptorType = USB_DT_INTERFACE,
235
236 .bInterfaceNumber = 1,
237 .bAlternateSetting = 1,
238 .bNumEndpoints = 2,
239 .bInterfaceClass = USB_CLASS_CDC_DATA,
240 .bInterfaceSubClass = 0,
241 .bInterfaceProtocol = USB_CDC_NCM_PROTO_NTB,
242 /* .iInterface = DYNAMIC */
243 };
244
245 /* full speed support: */
246
247 static struct usb_endpoint_descriptor fs_ncm_notify_desc = {
248 .bLength = USB_DT_ENDPOINT_SIZE,
249 .bDescriptorType = USB_DT_ENDPOINT,
250
251 .bEndpointAddress = USB_DIR_IN,
252 .bmAttributes = USB_ENDPOINT_XFER_INT,
253 .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT),
254 .bInterval = NCM_STATUS_INTERVAL_MS,
255 };
256
257 static struct usb_endpoint_descriptor fs_ncm_in_desc = {
258 .bLength = USB_DT_ENDPOINT_SIZE,
259 .bDescriptorType = USB_DT_ENDPOINT,
260
261 .bEndpointAddress = USB_DIR_IN,
262 .bmAttributes = USB_ENDPOINT_XFER_BULK,
263 };
264
265 static struct usb_endpoint_descriptor fs_ncm_out_desc = {
266 .bLength = USB_DT_ENDPOINT_SIZE,
267 .bDescriptorType = USB_DT_ENDPOINT,
268
269 .bEndpointAddress = USB_DIR_OUT,
270 .bmAttributes = USB_ENDPOINT_XFER_BULK,
271 };
272
273 static struct usb_descriptor_header *ncm_fs_function[] = {
274 (struct usb_descriptor_header *) &ncm_iad_desc,
275 /* CDC NCM control descriptors */
276 (struct usb_descriptor_header *) &ncm_control_intf,
277 (struct usb_descriptor_header *) &ncm_header_desc,
278 (struct usb_descriptor_header *) &ncm_union_desc,
279 (struct usb_descriptor_header *) &ecm_desc,
280 (struct usb_descriptor_header *) &ncm_desc,
281 (struct usb_descriptor_header *) &fs_ncm_notify_desc,
282 /* data interface, altsettings 0 and 1 */
283 (struct usb_descriptor_header *) &ncm_data_nop_intf,
284 (struct usb_descriptor_header *) &ncm_data_intf,
285 (struct usb_descriptor_header *) &fs_ncm_in_desc,
286 (struct usb_descriptor_header *) &fs_ncm_out_desc,
287 NULL,
288 };
289
290 /* high speed support: */
291
292 static struct usb_endpoint_descriptor hs_ncm_notify_desc = {
293 .bLength = USB_DT_ENDPOINT_SIZE,
294 .bDescriptorType = USB_DT_ENDPOINT,
295
296 .bEndpointAddress = USB_DIR_IN,
297 .bmAttributes = USB_ENDPOINT_XFER_INT,
298 .wMaxPacketSize = cpu_to_le16(NCM_STATUS_BYTECOUNT),
299 .bInterval = USB_MS_TO_HS_INTERVAL(NCM_STATUS_INTERVAL_MS),
300 };
301 static struct usb_endpoint_descriptor hs_ncm_in_desc = {
302 .bLength = USB_DT_ENDPOINT_SIZE,
303 .bDescriptorType = USB_DT_ENDPOINT,
304
305 .bEndpointAddress = USB_DIR_IN,
306 .bmAttributes = USB_ENDPOINT_XFER_BULK,
307 .wMaxPacketSize = cpu_to_le16(512),
308 };
309
310 static struct usb_endpoint_descriptor hs_ncm_out_desc = {
311 .bLength = USB_DT_ENDPOINT_SIZE,
312 .bDescriptorType = USB_DT_ENDPOINT,
313
314 .bEndpointAddress = USB_DIR_OUT,
315 .bmAttributes = USB_ENDPOINT_XFER_BULK,
316 .wMaxPacketSize = cpu_to_le16(512),
317 };
318
319 static struct usb_descriptor_header *ncm_hs_function[] = {
320 (struct usb_descriptor_header *) &ncm_iad_desc,
321 /* CDC NCM control descriptors */
322 (struct usb_descriptor_header *) &ncm_control_intf,
323 (struct usb_descriptor_header *) &ncm_header_desc,
324 (struct usb_descriptor_header *) &ncm_union_desc,
325 (struct usb_descriptor_header *) &ecm_desc,
326 (struct usb_descriptor_header *) &ncm_desc,
327 (struct usb_descriptor_header *) &hs_ncm_notify_desc,
328 /* data interface, altsettings 0 and 1 */
329 (struct usb_descriptor_header *) &ncm_data_nop_intf,
330 (struct usb_descriptor_header *) &ncm_data_intf,
331 (struct usb_descriptor_header *) &hs_ncm_in_desc,
332 (struct usb_descriptor_header *) &hs_ncm_out_desc,
333 NULL,
334 };
335
336 /* string descriptors: */
337
338 #define STRING_CTRL_IDX 0
339 #define STRING_MAC_IDX 1
340 #define STRING_DATA_IDX 2
341 #define STRING_IAD_IDX 3
342
343 static struct usb_string ncm_string_defs[] = {
344 [STRING_CTRL_IDX].s = "CDC Network Control Model (NCM)",
345 [STRING_MAC_IDX].s = "",
346 [STRING_DATA_IDX].s = "CDC Network Data",
347 [STRING_IAD_IDX].s = "CDC NCM",
348 { } /* end of list */
349 };
350
351 static struct usb_gadget_strings ncm_string_table = {
352 .language = 0x0409, /* en-us */
353 .strings = ncm_string_defs,
354 };
355
356 static struct usb_gadget_strings *ncm_strings[] = {
357 &ncm_string_table,
358 NULL,
359 };
360
361 /*
362 * Here are options for NCM Datagram Pointer table (NDP) parser.
363 * There are 2 different formats: NDP16 and NDP32 in the spec (ch. 3),
364 * in NDP16 offsets and sizes fields are 1 16bit word wide,
365 * in NDP32 -- 2 16bit words wide. Also signatures are different.
366 * To make the parser code the same, put the differences in the structure,
367 * and switch pointers to the structures when the format is changed.
368 */
369
370 struct ndp_parser_opts {
371 u32 nth_sign;
372 u32 ndp_sign;
373 unsigned nth_size;
374 unsigned ndp_size;
375 unsigned dpe_size;
376 unsigned ndplen_align;
377 /* sizes in u16 units */
378 unsigned dgram_item_len; /* index or length */
379 unsigned block_length;
380 unsigned ndp_index;
381 unsigned reserved1;
382 unsigned reserved2;
383 unsigned next_ndp_index;
384 };
385
386 #define INIT_NDP16_OPTS { \
387 .nth_sign = USB_CDC_NCM_NTH16_SIGN, \
388 .ndp_sign = USB_CDC_NCM_NDP16_NOCRC_SIGN, \
389 .nth_size = sizeof(struct usb_cdc_ncm_nth16), \
390 .ndp_size = sizeof(struct usb_cdc_ncm_ndp16), \
391 .dpe_size = sizeof(struct usb_cdc_ncm_dpe16), \
392 .ndplen_align = 4, \
393 .dgram_item_len = 1, \
394 .block_length = 1, \
395 .ndp_index = 1, \
396 .reserved1 = 0, \
397 .reserved2 = 0, \
398 .next_ndp_index = 1, \
399 }
400
401
402 #define INIT_NDP32_OPTS { \
403 .nth_sign = USB_CDC_NCM_NTH32_SIGN, \
404 .ndp_sign = USB_CDC_NCM_NDP32_NOCRC_SIGN, \
405 .nth_size = sizeof(struct usb_cdc_ncm_nth32), \
406 .ndp_size = sizeof(struct usb_cdc_ncm_ndp32), \
407 .dpe_size = sizeof(struct usb_cdc_ncm_dpe32), \
408 .ndplen_align = 8, \
409 .dgram_item_len = 2, \
410 .block_length = 2, \
411 .ndp_index = 2, \
412 .reserved1 = 1, \
413 .reserved2 = 2, \
414 .next_ndp_index = 2, \
415 }
416
417 static const struct ndp_parser_opts ndp16_opts = INIT_NDP16_OPTS;
418 static const struct ndp_parser_opts ndp32_opts = INIT_NDP32_OPTS;
419
420 static inline void put_ncm(__le16 **p, unsigned size, unsigned val)
421 {
422 switch (size) {
423 case 1:
424 put_unaligned_le16((u16)val, *p);
425 break;
426 case 2:
427 put_unaligned_le32((u32)val, *p);
428
429 break;
430 default:
431 BUG();
432 }
433
434 *p += size;
435 }
436
437 static inline unsigned get_ncm(__le16 **p, unsigned size)
438 {
439 unsigned tmp;
440
441 switch (size) {
442 case 1:
443 tmp = get_unaligned_le16(*p);
444 break;
445 case 2:
446 tmp = get_unaligned_le32(*p);
447 break;
448 default:
449 BUG();
450 }
451
452 *p += size;
453 return tmp;
454 }
455
456 /*-------------------------------------------------------------------------*/
457
458 static inline void ncm_reset_values(struct f_ncm *ncm)
459 {
460 ncm->parser_opts = &ndp16_opts;
461 ncm->is_crc = false;
462 ncm->port.cdc_filter = DEFAULT_FILTER;
463
464 /* doesn't make sense for ncm, fixed size used */
465 ncm->port.header_len = 0;
466
467 ncm->port.fixed_out_len = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
468 ncm->port.fixed_in_len = NTB_DEFAULT_IN_SIZE;
469 }
470
471 /*
472 * Context: ncm->lock held
473 */
474 static void ncm_do_notify(struct f_ncm *ncm)
475 {
476 struct usb_request *req = ncm->notify_req;
477 struct usb_cdc_notification *event;
478 struct usb_composite_dev *cdev = ncm->port.func.config->cdev;
479 __le32 *data;
480 int status;
481
482 /* notification already in flight? */
483 if (!req)
484 return;
485
486 event = req->buf;
487 switch (ncm->notify_state) {
488 case NCM_NOTIFY_NONE:
489 return;
490
491 case NCM_NOTIFY_CONNECT:
492 event->bNotificationType = USB_CDC_NOTIFY_NETWORK_CONNECTION;
493 if (ncm->is_open)
494 event->wValue = cpu_to_le16(1);
495 else
496 event->wValue = cpu_to_le16(0);
497 event->wLength = 0;
498 req->length = sizeof *event;
499
500 DBG(cdev, "notify connect %s\n",
501 ncm->is_open ? "true" : "false");
502 ncm->notify_state = NCM_NOTIFY_NONE;
503 break;
504
505 case NCM_NOTIFY_SPEED:
506 event->bNotificationType = USB_CDC_NOTIFY_SPEED_CHANGE;
507 event->wValue = cpu_to_le16(0);
508 event->wLength = cpu_to_le16(8);
509 req->length = NCM_STATUS_BYTECOUNT;
510
511 /* SPEED_CHANGE data is up/down speeds in bits/sec */
512 data = req->buf + sizeof *event;
513 data[0] = cpu_to_le32(ncm_bitrate(cdev->gadget));
514 data[1] = data[0];
515
516 DBG(cdev, "notify speed %d\n", ncm_bitrate(cdev->gadget));
517 ncm->notify_state = NCM_NOTIFY_CONNECT;
518 break;
519 }
520 event->bmRequestType = 0xA1;
521 event->wIndex = cpu_to_le16(ncm->ctrl_id);
522
523 ncm->notify_req = NULL;
524 /*
525 * In double buffering if there is a space in FIFO,
526 * completion callback can be called right after the call,
527 * so unlocking
528 */
529 spin_unlock(&ncm->lock);
530 status = usb_ep_queue(ncm->notify, req, GFP_ATOMIC);
531 spin_lock(&ncm->lock);
532 if (status < 0) {
533 ncm->notify_req = req;
534 DBG(cdev, "notify --> %d\n", status);
535 }
536 }
537
538 /*
539 * Context: ncm->lock held
540 */
541 static void ncm_notify(struct f_ncm *ncm)
542 {
543 /*
544 * NOTE on most versions of Linux, host side cdc-ethernet
545 * won't listen for notifications until its netdevice opens.
546 * The first notification then sits in the FIFO for a long
547 * time, and the second one is queued.
548 *
549 * If ncm_notify() is called before the second (CONNECT)
550 * notification is sent, then it will reset to send the SPEED
551 * notificaion again (and again, and again), but it's not a problem
552 */
553 ncm->notify_state = NCM_NOTIFY_SPEED;
554 ncm_do_notify(ncm);
555 }
556
557 static void ncm_notify_complete(struct usb_ep *ep, struct usb_request *req)
558 {
559 struct f_ncm *ncm = req->context;
560 struct usb_composite_dev *cdev = ncm->port.func.config->cdev;
561 struct usb_cdc_notification *event = req->buf;
562
563 spin_lock(&ncm->lock);
564 switch (req->status) {
565 case 0:
566 VDBG(cdev, "Notification %02x sent\n",
567 event->bNotificationType);
568 break;
569 case -ECONNRESET:
570 case -ESHUTDOWN:
571 ncm->notify_state = NCM_NOTIFY_NONE;
572 break;
573 default:
574 DBG(cdev, "event %02x --> %d\n",
575 event->bNotificationType, req->status);
576 break;
577 }
578 ncm->notify_req = req;
579 ncm_do_notify(ncm);
580 spin_unlock(&ncm->lock);
581 }
582
583 static void ncm_ep0out_complete(struct usb_ep *ep, struct usb_request *req)
584 {
585 /* now for SET_NTB_INPUT_SIZE only */
586 unsigned in_size;
587 struct usb_function *f = req->context;
588 struct f_ncm *ncm = func_to_ncm(f);
589 struct usb_composite_dev *cdev = ep->driver_data;
590
591 req->context = NULL;
592 if (req->status || req->actual != req->length) {
593 DBG(cdev, "Bad control-OUT transfer\n");
594 goto invalid;
595 }
596
597 in_size = get_unaligned_le32(req->buf);
598 if (in_size < USB_CDC_NCM_NTB_MIN_IN_SIZE ||
599 in_size > le32_to_cpu(ntb_parameters.dwNtbInMaxSize)) {
600 DBG(cdev, "Got wrong INPUT SIZE (%d) from host\n", in_size);
601 goto invalid;
602 }
603
604 ncm->port.fixed_in_len = in_size;
605 VDBG(cdev, "Set NTB INPUT SIZE %d\n", in_size);
606 return;
607
608 invalid:
609 usb_ep_set_halt(ep);
610 return;
611 }
612
613 static int ncm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
614 {
615 struct f_ncm *ncm = func_to_ncm(f);
616 struct usb_composite_dev *cdev = f->config->cdev;
617 struct usb_request *req = cdev->req;
618 int value = -EOPNOTSUPP;
619 u16 w_index = le16_to_cpu(ctrl->wIndex);
620 u16 w_value = le16_to_cpu(ctrl->wValue);
621 u16 w_length = le16_to_cpu(ctrl->wLength);
622
623 /*
624 * composite driver infrastructure handles everything except
625 * CDC class messages; interface activation uses set_alt().
626 */
627 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
628 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
629 | USB_CDC_SET_ETHERNET_PACKET_FILTER:
630 /*
631 * see 6.2.30: no data, wIndex = interface,
632 * wValue = packet filter bitmap
633 */
634 if (w_length != 0 || w_index != ncm->ctrl_id)
635 goto invalid;
636 DBG(cdev, "packet filter %02x\n", w_value);
637 /*
638 * REVISIT locking of cdc_filter. This assumes the UDC
639 * driver won't have a concurrent packet TX irq running on
640 * another CPU; or that if it does, this write is atomic...
641 */
642 ncm->port.cdc_filter = w_value;
643 value = 0;
644 break;
645 /*
646 * and optionally:
647 * case USB_CDC_SEND_ENCAPSULATED_COMMAND:
648 * case USB_CDC_GET_ENCAPSULATED_RESPONSE:
649 * case USB_CDC_SET_ETHERNET_MULTICAST_FILTERS:
650 * case USB_CDC_SET_ETHERNET_PM_PATTERN_FILTER:
651 * case USB_CDC_GET_ETHERNET_PM_PATTERN_FILTER:
652 * case USB_CDC_GET_ETHERNET_STATISTIC:
653 */
654
655 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
656 | USB_CDC_GET_NTB_PARAMETERS:
657
658 if (w_length == 0 || w_value != 0 || w_index != ncm->ctrl_id)
659 goto invalid;
660 value = w_length > sizeof ntb_parameters ?
661 sizeof ntb_parameters : w_length;
662 memcpy(req->buf, &ntb_parameters, value);
663 VDBG(cdev, "Host asked NTB parameters\n");
664 break;
665
666 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
667 | USB_CDC_GET_NTB_INPUT_SIZE:
668
669 if (w_length < 4 || w_value != 0 || w_index != ncm->ctrl_id)
670 goto invalid;
671 put_unaligned_le32(ncm->port.fixed_in_len, req->buf);
672 value = 4;
673 VDBG(cdev, "Host asked INPUT SIZE, sending %d\n",
674 ncm->port.fixed_in_len);
675 break;
676
677 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
678 | USB_CDC_SET_NTB_INPUT_SIZE:
679 {
680 if (w_length != 4 || w_value != 0 || w_index != ncm->ctrl_id)
681 goto invalid;
682 req->complete = ncm_ep0out_complete;
683 req->length = w_length;
684 req->context = f;
685
686 value = req->length;
687 break;
688 }
689
690 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
691 | USB_CDC_GET_NTB_FORMAT:
692 {
693 uint16_t format;
694
695 if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
696 goto invalid;
697 format = (ncm->parser_opts == &ndp16_opts) ? 0x0000 : 0x0001;
698 put_unaligned_le16(format, req->buf);
699 value = 2;
700 VDBG(cdev, "Host asked NTB FORMAT, sending %d\n", format);
701 break;
702 }
703
704 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
705 | USB_CDC_SET_NTB_FORMAT:
706 {
707 if (w_length != 0 || w_index != ncm->ctrl_id)
708 goto invalid;
709 switch (w_value) {
710 case 0x0000:
711 ncm->parser_opts = &ndp16_opts;
712 DBG(cdev, "NCM16 selected\n");
713 break;
714 case 0x0001:
715 ncm->parser_opts = &ndp32_opts;
716 DBG(cdev, "NCM32 selected\n");
717 break;
718 default:
719 goto invalid;
720 }
721 value = 0;
722 break;
723 }
724 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
725 | USB_CDC_GET_CRC_MODE:
726 {
727 uint16_t is_crc;
728
729 if (w_length < 2 || w_value != 0 || w_index != ncm->ctrl_id)
730 goto invalid;
731 is_crc = ncm->is_crc ? 0x0001 : 0x0000;
732 put_unaligned_le16(is_crc, req->buf);
733 value = 2;
734 VDBG(cdev, "Host asked CRC MODE, sending %d\n", is_crc);
735 break;
736 }
737
738 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
739 | USB_CDC_SET_CRC_MODE:
740 {
741 int ndp_hdr_crc = 0;
742
743 if (w_length != 0 || w_index != ncm->ctrl_id)
744 goto invalid;
745 switch (w_value) {
746 case 0x0000:
747 ncm->is_crc = false;
748 ndp_hdr_crc = NCM_NDP_HDR_NOCRC;
749 DBG(cdev, "non-CRC mode selected\n");
750 break;
751 case 0x0001:
752 ncm->is_crc = true;
753 ndp_hdr_crc = NCM_NDP_HDR_CRC;
754 DBG(cdev, "CRC mode selected\n");
755 break;
756 default:
757 goto invalid;
758 }
759 ncm->ndp_sign = ncm->parser_opts->ndp_sign | ndp_hdr_crc;
760 value = 0;
761 break;
762 }
763
764 /* and disabled in ncm descriptor: */
765 /* case USB_CDC_GET_NET_ADDRESS: */
766 /* case USB_CDC_SET_NET_ADDRESS: */
767 /* case USB_CDC_GET_MAX_DATAGRAM_SIZE: */
768 /* case USB_CDC_SET_MAX_DATAGRAM_SIZE: */
769
770 default:
771 invalid:
772 DBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
773 ctrl->bRequestType, ctrl->bRequest,
774 w_value, w_index, w_length);
775 }
776
777 /* respond with data transfer or status phase? */
778 if (value >= 0) {
779 DBG(cdev, "ncm req%02x.%02x v%04x i%04x l%d\n",
780 ctrl->bRequestType, ctrl->bRequest,
781 w_value, w_index, w_length);
782 req->zero = 0;
783 req->length = value;
784 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
785 if (value < 0)
786 ERROR(cdev, "ncm req %02x.%02x response err %d\n",
787 ctrl->bRequestType, ctrl->bRequest,
788 value);
789 }
790
791 /* device either stalls (value < 0) or reports success */
792 return value;
793 }
794
795
796 static int ncm_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
797 {
798 struct f_ncm *ncm = func_to_ncm(f);
799 struct usb_composite_dev *cdev = f->config->cdev;
800
801 /* Control interface has only altsetting 0 */
802 if (intf == ncm->ctrl_id) {
803 if (alt != 0)
804 goto fail;
805
806 if (ncm->notify->driver_data) {
807 DBG(cdev, "reset ncm control %d\n", intf);
808 usb_ep_disable(ncm->notify);
809 }
810
811 if (!(ncm->notify->desc)) {
812 DBG(cdev, "init ncm ctrl %d\n", intf);
813 if (config_ep_by_speed(cdev->gadget, f, ncm->notify))
814 goto fail;
815 }
816 usb_ep_enable(ncm->notify);
817 ncm->notify->driver_data = ncm;
818
819 /* Data interface has two altsettings, 0 and 1 */
820 } else if (intf == ncm->data_id) {
821 if (alt > 1)
822 goto fail;
823
824 if (ncm->port.in_ep->driver_data) {
825 DBG(cdev, "reset ncm\n");
826 ncm->timer_stopping = true;
827 ncm->netdev = NULL;
828 gether_disconnect(&ncm->port);
829 ncm_reset_values(ncm);
830 }
831
832 /*
833 * CDC Network only sends data in non-default altsettings.
834 * Changing altsettings resets filters, statistics, etc.
835 */
836 if (alt == 1) {
837 struct net_device *net;
838
839 if (!ncm->port.in_ep->desc ||
840 !ncm->port.out_ep->desc) {
841 DBG(cdev, "init ncm\n");
842 if (config_ep_by_speed(cdev->gadget, f,
843 ncm->port.in_ep) ||
844 config_ep_by_speed(cdev->gadget, f,
845 ncm->port.out_ep)) {
846 ncm->port.in_ep->desc = NULL;
847 ncm->port.out_ep->desc = NULL;
848 goto fail;
849 }
850 }
851
852 /* TODO */
853 /* Enable zlps by default for NCM conformance;
854 * override for musb_hdrc (avoids txdma ovhead)
855 */
856 ncm->port.is_zlp_ok =
857 gadget_is_zlp_supported(cdev->gadget);
858 ncm->port.cdc_filter = DEFAULT_FILTER;
859 DBG(cdev, "activate ncm\n");
860 net = gether_connect(&ncm->port);
861 if (IS_ERR(net))
862 return PTR_ERR(net);
863 ncm->netdev = net;
864 ncm->timer_stopping = false;
865 }
866
867 spin_lock(&ncm->lock);
868 ncm_notify(ncm);
869 spin_unlock(&ncm->lock);
870 } else
871 goto fail;
872
873 return 0;
874 fail:
875 return -EINVAL;
876 }
877
878 /*
879 * Because the data interface supports multiple altsettings,
880 * this NCM function *MUST* implement a get_alt() method.
881 */
882 static int ncm_get_alt(struct usb_function *f, unsigned intf)
883 {
884 struct f_ncm *ncm = func_to_ncm(f);
885
886 if (intf == ncm->ctrl_id)
887 return 0;
888 return ncm->port.in_ep->driver_data ? 1 : 0;
889 }
890
891 static struct sk_buff *package_for_tx(struct f_ncm *ncm)
892 {
893 __le16 *ntb_iter;
894 struct sk_buff *skb2 = NULL;
895 unsigned ndp_pad;
896 unsigned ndp_index;
897 unsigned new_len;
898
899 const struct ndp_parser_opts *opts = ncm->parser_opts;
900 const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment);
901 const int dgram_idx_len = 2 * 2 * opts->dgram_item_len;
902
903 /* Stop the timer */
904 hrtimer_try_to_cancel(&ncm->task_timer);
905
906 ndp_pad = ALIGN(ncm->skb_tx_data->len, ndp_align) -
907 ncm->skb_tx_data->len;
908 ndp_index = ncm->skb_tx_data->len + ndp_pad;
909 new_len = ndp_index + dgram_idx_len + ncm->skb_tx_ndp->len;
910
911 /* Set the final BlockLength and wNdpIndex */
912 ntb_iter = (void *) ncm->skb_tx_data->data;
913 /* Increment pointer to BlockLength */
914 ntb_iter += 2 + 1 + 1;
915 put_ncm(&ntb_iter, opts->block_length, new_len);
916 put_ncm(&ntb_iter, opts->ndp_index, ndp_index);
917
918 /* Set the final NDP wLength */
919 new_len = opts->ndp_size +
920 (ncm->ndp_dgram_count * dgram_idx_len);
921 ncm->ndp_dgram_count = 0;
922 /* Increment from start to wLength */
923 ntb_iter = (void *) ncm->skb_tx_ndp->data;
924 ntb_iter += 2;
925 put_unaligned_le16(new_len, ntb_iter);
926
927 /* Merge the skbs */
928 swap(skb2, ncm->skb_tx_data);
929 if (ncm->skb_tx_data) {
930 dev_kfree_skb_any(ncm->skb_tx_data);
931 ncm->skb_tx_data = NULL;
932 }
933
934 /* Insert NDP alignment. */
935 ntb_iter = (void *) skb_put(skb2, ndp_pad);
936 memset(ntb_iter, 0, ndp_pad);
937
938 /* Copy NTB across. */
939 ntb_iter = (void *) skb_put(skb2, ncm->skb_tx_ndp->len);
940 memcpy(ntb_iter, ncm->skb_tx_ndp->data, ncm->skb_tx_ndp->len);
941 dev_kfree_skb_any(ncm->skb_tx_ndp);
942 ncm->skb_tx_ndp = NULL;
943
944 /* Insert zero'd datagram. */
945 ntb_iter = (void *) skb_put(skb2, dgram_idx_len);
946 memset(ntb_iter, 0, dgram_idx_len);
947
948 return skb2;
949 }
950
951 static struct sk_buff *ncm_wrap_ntb(struct gether *port,
952 struct sk_buff *skb)
953 {
954 struct f_ncm *ncm = func_to_ncm(&port->func);
955 struct sk_buff *skb2 = NULL;
956 int ncb_len = 0;
957 __le16 *ntb_data;
958 __le16 *ntb_ndp;
959 int dgram_pad;
960
961 unsigned max_size = ncm->port.fixed_in_len;
962 const struct ndp_parser_opts *opts = ncm->parser_opts;
963 const int ndp_align = le16_to_cpu(ntb_parameters.wNdpInAlignment);
964 const int div = le16_to_cpu(ntb_parameters.wNdpInDivisor);
965 const int rem = le16_to_cpu(ntb_parameters.wNdpInPayloadRemainder);
966 const int dgram_idx_len = 2 * 2 * opts->dgram_item_len;
967
968 if (!skb && !ncm->skb_tx_data)
969 return NULL;
970
971 if (skb) {
972 /* Add the CRC if required up front */
973 if (ncm->is_crc) {
974 uint32_t crc;
975 __le16 *crc_pos;
976
977 crc = ~crc32_le(~0,
978 skb->data,
979 skb->len);
980 crc_pos = (void *) skb_put(skb, sizeof(uint32_t));
981 put_unaligned_le32(crc, crc_pos);
982 }
983
984 /* If the new skb is too big for the current NCM NTB then
985 * set the current stored skb to be sent now and clear it
986 * ready for new data.
987 * NOTE: Assume maximum align for speed of calculation.
988 */
989 if (ncm->skb_tx_data
990 && (ncm->ndp_dgram_count >= TX_MAX_NUM_DPE
991 || (ncm->skb_tx_data->len +
992 div + rem + skb->len +
993 ncm->skb_tx_ndp->len + ndp_align + (2 * dgram_idx_len))
994 > max_size)) {
995 skb2 = package_for_tx(ncm);
996 if (!skb2)
997 goto err;
998 }
999
1000 if (!ncm->skb_tx_data) {
1001 ncb_len = opts->nth_size;
1002 dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len;
1003 ncb_len += dgram_pad;
1004
1005 /* Create a new skb for the NTH and datagrams. */
1006 ncm->skb_tx_data = alloc_skb(max_size, GFP_ATOMIC);
1007 if (!ncm->skb_tx_data)
1008 goto err;
1009
1010 ntb_data = (void *) skb_put(ncm->skb_tx_data, ncb_len);
1011 memset(ntb_data, 0, ncb_len);
1012 /* dwSignature */
1013 put_unaligned_le32(opts->nth_sign, ntb_data);
1014 ntb_data += 2;
1015 /* wHeaderLength */
1016 put_unaligned_le16(opts->nth_size, ntb_data++);
1017
1018 /* Allocate an skb for storing the NDP,
1019 * TX_MAX_NUM_DPE should easily suffice for a
1020 * 16k packet.
1021 */
1022 ncm->skb_tx_ndp = alloc_skb((int)(opts->ndp_size
1023 + opts->dpe_size
1024 * TX_MAX_NUM_DPE),
1025 GFP_ATOMIC);
1026 if (!ncm->skb_tx_ndp)
1027 goto err;
1028 ntb_ndp = (void *) skb_put(ncm->skb_tx_ndp,
1029 opts->ndp_size);
1030 memset(ntb_ndp, 0, ncb_len);
1031 /* dwSignature */
1032 put_unaligned_le32(ncm->ndp_sign, ntb_ndp);
1033 ntb_ndp += 2;
1034
1035 /* There is always a zeroed entry */
1036 ncm->ndp_dgram_count = 1;
1037
1038 /* Note: we skip opts->next_ndp_index */
1039 }
1040
1041 /* Delay the timer. */
1042 hrtimer_start(&ncm->task_timer,
1043 ktime_set(0, TX_TIMEOUT_NSECS),
1044 HRTIMER_MODE_REL);
1045
1046 /* Add the datagram position entries */
1047 ntb_ndp = (void *) skb_put(ncm->skb_tx_ndp, dgram_idx_len);
1048 memset(ntb_ndp, 0, dgram_idx_len);
1049
1050 ncb_len = ncm->skb_tx_data->len;
1051 dgram_pad = ALIGN(ncb_len, div) + rem - ncb_len;
1052 ncb_len += dgram_pad;
1053
1054 /* (d)wDatagramIndex */
1055 put_ncm(&ntb_ndp, opts->dgram_item_len, ncb_len);
1056 /* (d)wDatagramLength */
1057 put_ncm(&ntb_ndp, opts->dgram_item_len, skb->len);
1058 ncm->ndp_dgram_count++;
1059
1060 /* Add the new data to the skb */
1061 ntb_data = (void *) skb_put(ncm->skb_tx_data, dgram_pad);
1062 memset(ntb_data, 0, dgram_pad);
1063 ntb_data = (void *) skb_put(ncm->skb_tx_data, skb->len);
1064 memcpy(ntb_data, skb->data, skb->len);
1065 dev_kfree_skb_any(skb);
1066 skb = NULL;
1067
1068 } else if (ncm->skb_tx_data && ncm->timer_force_tx) {
1069 /* If the tx was requested because of a timeout then send */
1070 skb2 = package_for_tx(ncm);
1071 if (!skb2)
1072 goto err;
1073 }
1074
1075 return skb2;
1076
1077 err:
1078 ncm->netdev->stats.tx_dropped++;
1079
1080 if (skb)
1081 dev_kfree_skb_any(skb);
1082 if (ncm->skb_tx_data)
1083 dev_kfree_skb_any(ncm->skb_tx_data);
1084 if (ncm->skb_tx_ndp)
1085 dev_kfree_skb_any(ncm->skb_tx_ndp);
1086
1087 return NULL;
1088 }
1089
1090 /*
1091 * This transmits the NTB if there are frames waiting.
1092 */
1093 static void ncm_tx_tasklet(unsigned long data)
1094 {
1095 struct f_ncm *ncm = (void *)data;
1096
1097 if (ncm->timer_stopping)
1098 return;
1099
1100 /* Only send if data is available. */
1101 if (ncm->skb_tx_data) {
1102 ncm->timer_force_tx = true;
1103
1104 /* XXX This allowance of a NULL skb argument to ndo_start_xmit
1105 * XXX is not sane. The gadget layer should be redesigned so
1106 * XXX that the dev->wrap() invocations to build SKBs is transparent
1107 * XXX and performed in some way outside of the ndo_start_xmit
1108 * XXX interface.
1109 */
1110 ncm->netdev->netdev_ops->ndo_start_xmit(NULL, ncm->netdev);
1111
1112 ncm->timer_force_tx = false;
1113 }
1114 }
1115
1116 /*
1117 * The transmit should only be run if no skb data has been sent
1118 * for a certain duration.
1119 */
1120 static enum hrtimer_restart ncm_tx_timeout(struct hrtimer *data)
1121 {
1122 struct f_ncm *ncm = container_of(data, struct f_ncm, task_timer);
1123 tasklet_schedule(&ncm->tx_tasklet);
1124 return HRTIMER_NORESTART;
1125 }
1126
1127 static int ncm_unwrap_ntb(struct gether *port,
1128 struct sk_buff *skb,
1129 struct sk_buff_head *list)
1130 {
1131 struct f_ncm *ncm = func_to_ncm(&port->func);
1132 __le16 *tmp = (void *) skb->data;
1133 unsigned index, index2;
1134 int ndp_index;
1135 unsigned dg_len, dg_len2;
1136 unsigned ndp_len;
1137 struct sk_buff *skb2;
1138 int ret = -EINVAL;
1139 unsigned max_size = le32_to_cpu(ntb_parameters.dwNtbOutMaxSize);
1140 const struct ndp_parser_opts *opts = ncm->parser_opts;
1141 unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
1142 int dgram_counter;
1143
1144 /* dwSignature */
1145 if (get_unaligned_le32(tmp) != opts->nth_sign) {
1146 INFO(port->func.config->cdev, "Wrong NTH SIGN, skblen %d\n",
1147 skb->len);
1148 print_hex_dump(KERN_INFO, "HEAD:", DUMP_PREFIX_ADDRESS, 32, 1,
1149 skb->data, 32, false);
1150
1151 goto err;
1152 }
1153 tmp += 2;
1154 /* wHeaderLength */
1155 if (get_unaligned_le16(tmp++) != opts->nth_size) {
1156 INFO(port->func.config->cdev, "Wrong NTB headersize\n");
1157 goto err;
1158 }
1159 tmp++; /* skip wSequence */
1160
1161 /* (d)wBlockLength */
1162 if (get_ncm(&tmp, opts->block_length) > max_size) {
1163 INFO(port->func.config->cdev, "OUT size exceeded\n");
1164 goto err;
1165 }
1166
1167 ndp_index = get_ncm(&tmp, opts->ndp_index);
1168
1169 /* Run through all the NDP's in the NTB */
1170 do {
1171 /* NCM 3.2 */
1172 if (((ndp_index % 4) != 0) &&
1173 (ndp_index < opts->nth_size)) {
1174 INFO(port->func.config->cdev, "Bad index: %#X\n",
1175 ndp_index);
1176 goto err;
1177 }
1178
1179 /* walk through NDP */
1180 tmp = (void *)(skb->data + ndp_index);
1181 if (get_unaligned_le32(tmp) != ncm->ndp_sign) {
1182 INFO(port->func.config->cdev, "Wrong NDP SIGN\n");
1183 goto err;
1184 }
1185 tmp += 2;
1186
1187 ndp_len = get_unaligned_le16(tmp++);
1188 /*
1189 * NCM 3.3.1
1190 * entry is 2 items
1191 * item size is 16/32 bits, opts->dgram_item_len * 2 bytes
1192 * minimal: struct usb_cdc_ncm_ndpX + normal entry + zero entry
1193 * Each entry is a dgram index and a dgram length.
1194 */
1195 if ((ndp_len < opts->ndp_size
1196 + 2 * 2 * (opts->dgram_item_len * 2))
1197 || (ndp_len % opts->ndplen_align != 0)) {
1198 INFO(port->func.config->cdev, "Bad NDP length: %#X\n",
1199 ndp_len);
1200 goto err;
1201 }
1202 tmp += opts->reserved1;
1203 /* Check for another NDP (d)wNextNdpIndex */
1204 ndp_index = get_ncm(&tmp, opts->next_ndp_index);
1205 tmp += opts->reserved2;
1206
1207 ndp_len -= opts->ndp_size;
1208 index2 = get_ncm(&tmp, opts->dgram_item_len);
1209 dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
1210 dgram_counter = 0;
1211
1212 do {
1213 index = index2;
1214 dg_len = dg_len2;
1215 if (dg_len < 14 + crc_len) { /* ethernet hdr + crc */
1216 INFO(port->func.config->cdev,
1217 "Bad dgram length: %#X\n", dg_len);
1218 goto err;
1219 }
1220 if (ncm->is_crc) {
1221 uint32_t crc, crc2;
1222
1223 crc = get_unaligned_le32(skb->data +
1224 index + dg_len -
1225 crc_len);
1226 crc2 = ~crc32_le(~0,
1227 skb->data + index,
1228 dg_len - crc_len);
1229 if (crc != crc2) {
1230 INFO(port->func.config->cdev,
1231 "Bad CRC\n");
1232 goto err;
1233 }
1234 }
1235
1236 index2 = get_ncm(&tmp, opts->dgram_item_len);
1237 dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
1238
1239 /*
1240 * Copy the data into a new skb.
1241 * This ensures the truesize is correct
1242 */
1243 skb2 = netdev_alloc_skb_ip_align(ncm->netdev,
1244 dg_len - crc_len);
1245 if (skb2 == NULL)
1246 goto err;
1247 memcpy(skb_put(skb2, dg_len - crc_len),
1248 skb->data + index, dg_len - crc_len);
1249
1250 skb_queue_tail(list, skb2);
1251
1252 ndp_len -= 2 * (opts->dgram_item_len * 2);
1253
1254 dgram_counter++;
1255
1256 if (index2 == 0 || dg_len2 == 0)
1257 break;
1258 } while (ndp_len > 2 * (opts->dgram_item_len * 2));
1259 } while (ndp_index);
1260
1261 dev_kfree_skb_any(skb);
1262
1263 VDBG(port->func.config->cdev,
1264 "Parsed NTB with %d frames\n", dgram_counter);
1265 return 0;
1266 err:
1267 skb_queue_purge(list);
1268 dev_kfree_skb_any(skb);
1269 return ret;
1270 }
1271
1272 static void ncm_disable(struct usb_function *f)
1273 {
1274 struct f_ncm *ncm = func_to_ncm(f);
1275 struct usb_composite_dev *cdev = f->config->cdev;
1276
1277 DBG(cdev, "ncm deactivated\n");
1278
1279 if (ncm->port.in_ep->driver_data) {
1280 ncm->timer_stopping = true;
1281 ncm->netdev = NULL;
1282 gether_disconnect(&ncm->port);
1283 }
1284
1285 if (ncm->notify->driver_data) {
1286 usb_ep_disable(ncm->notify);
1287 ncm->notify->driver_data = NULL;
1288 ncm->notify->desc = NULL;
1289 }
1290 }
1291
1292 /*-------------------------------------------------------------------------*/
1293
1294 /*
1295 * Callbacks let us notify the host about connect/disconnect when the
1296 * net device is opened or closed.
1297 *
1298 * For testing, note that link states on this side include both opened
1299 * and closed variants of:
1300 *
1301 * - disconnected/unconfigured
1302 * - configured but inactive (data alt 0)
1303 * - configured and active (data alt 1)
1304 *
1305 * Each needs to be tested with unplug, rmmod, SET_CONFIGURATION, and
1306 * SET_INTERFACE (altsetting). Remember also that "configured" doesn't
1307 * imply the host is actually polling the notification endpoint, and
1308 * likewise that "active" doesn't imply it's actually using the data
1309 * endpoints for traffic.
1310 */
1311
1312 static void ncm_open(struct gether *geth)
1313 {
1314 struct f_ncm *ncm = func_to_ncm(&geth->func);
1315
1316 DBG(ncm->port.func.config->cdev, "%s\n", __func__);
1317
1318 spin_lock(&ncm->lock);
1319 ncm->is_open = true;
1320 ncm_notify(ncm);
1321 spin_unlock(&ncm->lock);
1322 }
1323
1324 static void ncm_close(struct gether *geth)
1325 {
1326 struct f_ncm *ncm = func_to_ncm(&geth->func);
1327
1328 DBG(ncm->port.func.config->cdev, "%s\n", __func__);
1329
1330 spin_lock(&ncm->lock);
1331 ncm->is_open = false;
1332 ncm_notify(ncm);
1333 spin_unlock(&ncm->lock);
1334 }
1335
1336 /*-------------------------------------------------------------------------*/
1337
1338 /* ethernet function driver setup/binding */
1339
1340 static int ncm_bind(struct usb_configuration *c, struct usb_function *f)
1341 {
1342 struct usb_composite_dev *cdev = c->cdev;
1343 struct f_ncm *ncm = func_to_ncm(f);
1344 struct usb_string *us;
1345 int status;
1346 struct usb_ep *ep;
1347 struct f_ncm_opts *ncm_opts;
1348
1349 if (!can_support_ecm(cdev->gadget))
1350 return -EINVAL;
1351
1352 ncm_opts = container_of(f->fi, struct f_ncm_opts, func_inst);
1353 /*
1354 * in drivers/usb/gadget/configfs.c:configfs_composite_bind()
1355 * configurations are bound in sequence with list_for_each_entry,
1356 * in each configuration its functions are bound in sequence
1357 * with list_for_each_entry, so we assume no race condition
1358 * with regard to ncm_opts->bound access
1359 */
1360 if (!ncm_opts->bound) {
1361 mutex_lock(&ncm_opts->lock);
1362 gether_set_gadget(ncm_opts->net, cdev->gadget);
1363 status = gether_register_netdev(ncm_opts->net);
1364 mutex_unlock(&ncm_opts->lock);
1365 if (status)
1366 return status;
1367 ncm_opts->bound = true;
1368 }
1369 us = usb_gstrings_attach(cdev, ncm_strings,
1370 ARRAY_SIZE(ncm_string_defs));
1371 if (IS_ERR(us))
1372 return PTR_ERR(us);
1373 ncm_control_intf.iInterface = us[STRING_CTRL_IDX].id;
1374 ncm_data_nop_intf.iInterface = us[STRING_DATA_IDX].id;
1375 ncm_data_intf.iInterface = us[STRING_DATA_IDX].id;
1376 ecm_desc.iMACAddress = us[STRING_MAC_IDX].id;
1377 ncm_iad_desc.iFunction = us[STRING_IAD_IDX].id;
1378
1379 /* allocate instance-specific interface IDs */
1380 status = usb_interface_id(c, f);
1381 if (status < 0)
1382 goto fail;
1383 ncm->ctrl_id = status;
1384 ncm_iad_desc.bFirstInterface = status;
1385
1386 ncm_control_intf.bInterfaceNumber = status;
1387 ncm_union_desc.bMasterInterface0 = status;
1388
1389 status = usb_interface_id(c, f);
1390 if (status < 0)
1391 goto fail;
1392 ncm->data_id = status;
1393
1394 ncm_data_nop_intf.bInterfaceNumber = status;
1395 ncm_data_intf.bInterfaceNumber = status;
1396 ncm_union_desc.bSlaveInterface0 = status;
1397
1398 status = -ENODEV;
1399
1400 /* allocate instance-specific endpoints */
1401 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_in_desc);
1402 if (!ep)
1403 goto fail;
1404 ncm->port.in_ep = ep;
1405 ep->driver_data = cdev; /* claim */
1406
1407 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_out_desc);
1408 if (!ep)
1409 goto fail;
1410 ncm->port.out_ep = ep;
1411 ep->driver_data = cdev; /* claim */
1412
1413 ep = usb_ep_autoconfig(cdev->gadget, &fs_ncm_notify_desc);
1414 if (!ep)
1415 goto fail;
1416 ncm->notify = ep;
1417 ep->driver_data = cdev; /* claim */
1418
1419 status = -ENOMEM;
1420
1421 /* allocate notification request and buffer */
1422 ncm->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
1423 if (!ncm->notify_req)
1424 goto fail;
1425 ncm->notify_req->buf = kmalloc(NCM_STATUS_BYTECOUNT, GFP_KERNEL);
1426 if (!ncm->notify_req->buf)
1427 goto fail;
1428 ncm->notify_req->context = ncm;
1429 ncm->notify_req->complete = ncm_notify_complete;
1430
1431 /*
1432 * support all relevant hardware speeds... we expect that when
1433 * hardware is dual speed, all bulk-capable endpoints work at
1434 * both speeds
1435 */
1436 hs_ncm_in_desc.bEndpointAddress = fs_ncm_in_desc.bEndpointAddress;
1437 hs_ncm_out_desc.bEndpointAddress = fs_ncm_out_desc.bEndpointAddress;
1438 hs_ncm_notify_desc.bEndpointAddress =
1439 fs_ncm_notify_desc.bEndpointAddress;
1440
1441 status = usb_assign_descriptors(f, ncm_fs_function, ncm_hs_function,
1442 NULL);
1443 if (status)
1444 goto fail;
1445
1446 /*
1447 * NOTE: all that is done without knowing or caring about
1448 * the network link ... which is unavailable to this code
1449 * until we're activated via set_alt().
1450 */
1451
1452 ncm->port.open = ncm_open;
1453 ncm->port.close = ncm_close;
1454
1455 tasklet_init(&ncm->tx_tasklet, ncm_tx_tasklet, (unsigned long) ncm);
1456 hrtimer_init(&ncm->task_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
1457 ncm->task_timer.function = ncm_tx_timeout;
1458
1459 DBG(cdev, "CDC Network: %s speed IN/%s OUT/%s NOTIFY/%s\n",
1460 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
1461 ncm->port.in_ep->name, ncm->port.out_ep->name,
1462 ncm->notify->name);
1463 return 0;
1464
1465 fail:
1466 if (ncm->notify_req) {
1467 kfree(ncm->notify_req->buf);
1468 usb_ep_free_request(ncm->notify, ncm->notify_req);
1469 }
1470
1471 /* we might as well release our claims on endpoints */
1472 if (ncm->notify)
1473 ncm->notify->driver_data = NULL;
1474 if (ncm->port.out_ep)
1475 ncm->port.out_ep->driver_data = NULL;
1476 if (ncm->port.in_ep)
1477 ncm->port.in_ep->driver_data = NULL;
1478
1479 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
1480
1481 return status;
1482 }
1483
1484 static inline struct f_ncm_opts *to_f_ncm_opts(struct config_item *item)
1485 {
1486 return container_of(to_config_group(item), struct f_ncm_opts,
1487 func_inst.group);
1488 }
1489
1490 /* f_ncm_item_ops */
1491 USB_ETHERNET_CONFIGFS_ITEM(ncm);
1492
1493 /* f_ncm_opts_dev_addr */
1494 USB_ETHERNET_CONFIGFS_ITEM_ATTR_DEV_ADDR(ncm);
1495
1496 /* f_ncm_opts_host_addr */
1497 USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(ncm);
1498
1499 /* f_ncm_opts_qmult */
1500 USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(ncm);
1501
1502 /* f_ncm_opts_ifname */
1503 USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(ncm);
1504
1505 static struct configfs_attribute *ncm_attrs[] = {
1506 &f_ncm_opts_dev_addr.attr,
1507 &f_ncm_opts_host_addr.attr,
1508 &f_ncm_opts_qmult.attr,
1509 &f_ncm_opts_ifname.attr,
1510 NULL,
1511 };
1512
1513 static struct config_item_type ncm_func_type = {
1514 .ct_item_ops = &ncm_item_ops,
1515 .ct_attrs = ncm_attrs,
1516 .ct_owner = THIS_MODULE,
1517 };
1518
1519 static void ncm_free_inst(struct usb_function_instance *f)
1520 {
1521 struct f_ncm_opts *opts;
1522
1523 opts = container_of(f, struct f_ncm_opts, func_inst);
1524 if (opts->bound)
1525 gether_cleanup(netdev_priv(opts->net));
1526 else
1527 free_netdev(opts->net);
1528 kfree(opts);
1529 }
1530
1531 static struct usb_function_instance *ncm_alloc_inst(void)
1532 {
1533 struct f_ncm_opts *opts;
1534
1535 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1536 if (!opts)
1537 return ERR_PTR(-ENOMEM);
1538 mutex_init(&opts->lock);
1539 opts->func_inst.free_func_inst = ncm_free_inst;
1540 opts->net = gether_setup_default();
1541 if (IS_ERR(opts->net)) {
1542 struct net_device *net = opts->net;
1543 kfree(opts);
1544 return ERR_CAST(net);
1545 }
1546
1547 config_group_init_type_name(&opts->func_inst.group, "", &ncm_func_type);
1548
1549 return &opts->func_inst;
1550 }
1551
1552 static void ncm_free(struct usb_function *f)
1553 {
1554 struct f_ncm *ncm;
1555 struct f_ncm_opts *opts;
1556
1557 ncm = func_to_ncm(f);
1558 opts = container_of(f->fi, struct f_ncm_opts, func_inst);
1559 kfree(ncm);
1560 mutex_lock(&opts->lock);
1561 opts->refcnt--;
1562 mutex_unlock(&opts->lock);
1563 }
1564
1565 static void ncm_unbind(struct usb_configuration *c, struct usb_function *f)
1566 {
1567 struct f_ncm *ncm = func_to_ncm(f);
1568
1569 DBG(c->cdev, "ncm unbind\n");
1570
1571 hrtimer_cancel(&ncm->task_timer);
1572 tasklet_kill(&ncm->tx_tasklet);
1573
1574 ncm_string_defs[0].id = 0;
1575 usb_free_all_descriptors(f);
1576
1577 kfree(ncm->notify_req->buf);
1578 usb_ep_free_request(ncm->notify, ncm->notify_req);
1579 }
1580
1581 static struct usb_function *ncm_alloc(struct usb_function_instance *fi)
1582 {
1583 struct f_ncm *ncm;
1584 struct f_ncm_opts *opts;
1585 int status;
1586
1587 /* allocate and initialize one new instance */
1588 ncm = kzalloc(sizeof(*ncm), GFP_KERNEL);
1589 if (!ncm)
1590 return ERR_PTR(-ENOMEM);
1591
1592 opts = container_of(fi, struct f_ncm_opts, func_inst);
1593 mutex_lock(&opts->lock);
1594 opts->refcnt++;
1595
1596 /* export host's Ethernet address in CDC format */
1597 status = gether_get_host_addr_cdc(opts->net, ncm->ethaddr,
1598 sizeof(ncm->ethaddr));
1599 if (status < 12) { /* strlen("01234567890a") */
1600 kfree(ncm);
1601 mutex_unlock(&opts->lock);
1602 return ERR_PTR(-EINVAL);
1603 }
1604 ncm_string_defs[STRING_MAC_IDX].s = ncm->ethaddr;
1605
1606 spin_lock_init(&ncm->lock);
1607 ncm_reset_values(ncm);
1608 ncm->port.ioport = netdev_priv(opts->net);
1609 mutex_unlock(&opts->lock);
1610 ncm->port.is_fixed = true;
1611 ncm->port.supports_multi_frame = true;
1612
1613 ncm->port.func.name = "cdc_network";
1614 /* descriptors are per-instance copies */
1615 ncm->port.func.bind = ncm_bind;
1616 ncm->port.func.unbind = ncm_unbind;
1617 ncm->port.func.set_alt = ncm_set_alt;
1618 ncm->port.func.get_alt = ncm_get_alt;
1619 ncm->port.func.setup = ncm_setup;
1620 ncm->port.func.disable = ncm_disable;
1621 ncm->port.func.free_func = ncm_free;
1622
1623 ncm->port.wrap = ncm_wrap_ntb;
1624 ncm->port.unwrap = ncm_unwrap_ntb;
1625
1626 return &ncm->port.func;
1627 }
1628
1629 DECLARE_USB_FUNCTION_INIT(ncm, ncm_alloc_inst, ncm_alloc);
1630 MODULE_LICENSE("GPL");
1631 MODULE_AUTHOR("Yauheni Kaliuta");
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