2 * f_rndis.c -- RNDIS link function driver
4 * Copyright (C) 2003-2005,2008 David Brownell
5 * Copyright (C) 2003-2004 Robert Schwebel, Benedikt Spranger
6 * Copyright (C) 2008 Nokia Corporation
7 * Copyright (C) 2009 Samsung Electronics
8 * Author: Michal Nazarewicz (mina86@mina86.com)
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
16 /* #define VERBOSE_DEBUG */
18 #include <linux/slab.h>
19 #include <linux/kernel.h>
20 #include <linux/device.h>
21 #include <linux/etherdevice.h>
23 #include <linux/atomic.h>
29 * This function is an RNDIS Ethernet port -- a Microsoft protocol that's
30 * been promoted instead of the standard CDC Ethernet. The published RNDIS
31 * spec is ambiguous, incomplete, and needlessly complex. Variants such as
32 * ActiveSync have even worse status in terms of specification.
34 * In short: it's a protocol controlled by (and for) Microsoft, not for an
35 * Open ecosystem or markets. Linux supports it *only* because Microsoft
36 * doesn't support the CDC Ethernet standard.
38 * The RNDIS data transfer model is complex, with multiple Ethernet packets
39 * per USB message, and out of band data. The control model is built around
40 * what's essentially an "RNDIS RPC" protocol. It's all wrapped in a CDC ACM
41 * (modem, not Ethernet) veneer, with those ACM descriptors being entirely
42 * useless (they're ignored). RNDIS expects to be the only function in its
43 * configuration, so it's no real help if you need composite devices; and
44 * it expects to be the first configuration too.
46 * There is a single technical advantage of RNDIS over CDC Ethernet, if you
47 * discount the fluff that its RPC can be made to deliver: it doesn't need
48 * a NOP altsetting for the data interface. That lets it work on some of the
49 * "so smart it's stupid" hardware which takes over configuration changes
50 * from the software, and adds restrictions like "no altsettings".
52 * Unfortunately MSFT's RNDIS drivers are buggy. They hang or oops, and
53 * have all sorts of contrary-to-specification oddities that can prevent
54 * them from working sanely. Since bugfixes (or accurate specs, letting
55 * Linux work around those bugs) are unlikely to ever come from MSFT, you
56 * may want to avoid using RNDIS on purely operational grounds.
58 * Omissions from the RNDIS 1.0 specification include:
60 * - Power management ... references data that's scattered around lots
61 * of other documentation, which is incorrect/incomplete there too.
63 * - There are various undocumented protocol requirements, like the need
64 * to send garbage in some control-OUT messages.
66 * - MS-Windows drivers sometimes emit undocumented requests.
69 static unsigned int rndis_dl_max_pkt_per_xfer = 3;
70 module_param(rndis_dl_max_pkt_per_xfer, uint, S_IRUGO | S_IWUSR);
71 MODULE_PARM_DESC(rndis_dl_max_pkt_per_xfer,
72 "Maximum packets per transfer for DL aggregation");
74 static unsigned int rndis_ul_max_pkt_per_xfer = 3;
75 module_param(rndis_ul_max_pkt_per_xfer, uint, S_IRUGO | S_IWUSR);
76 MODULE_PARM_DESC(rndis_ul_max_pkt_per_xfer,
77 "Maximum packets per transfer for UL aggregation");
84 const char *manufacturer;
87 struct usb_ep *notify;
88 struct usb_request *notify_req;
89 atomic_t notify_count;
92 static inline struct f_rndis *func_to_rndis(struct usb_function *f)
94 return container_of(f, struct f_rndis, port.func);
97 /* peak (theoretical) bulk transfer rate in bits-per-second */
98 static unsigned int bitrate(struct usb_gadget *g)
100 if (gadget_is_superspeed(g) && g->speed == USB_SPEED_SUPER)
101 return 13 * 1024 * 8 * 1000 * 8;
102 else if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
103 return 13 * 512 * 8 * 1000 * 8;
105 return 19 * 64 * 1 * 1000 * 8;
108 /*-------------------------------------------------------------------------*/
113 #define RNDIS_STATUS_INTERVAL_MS 32
114 #define STATUS_BYTECOUNT 8 /* 8 bytes data */
117 /* interface descriptor: */
119 static struct usb_interface_descriptor rndis_control_intf = {
120 .bLength = sizeof rndis_control_intf,
121 .bDescriptorType = USB_DT_INTERFACE,
123 /* .bInterfaceNumber = DYNAMIC */
124 /* status endpoint is optional; this could be patched later */
126 .bInterfaceClass = USB_CLASS_COMM,
127 .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
128 .bInterfaceProtocol = USB_CDC_ACM_PROTO_VENDOR,
129 /* .iInterface = DYNAMIC */
132 static struct usb_cdc_header_desc header_desc = {
133 .bLength = sizeof header_desc,
134 .bDescriptorType = USB_DT_CS_INTERFACE,
135 .bDescriptorSubType = USB_CDC_HEADER_TYPE,
137 .bcdCDC = cpu_to_le16(0x0110),
140 static struct usb_cdc_call_mgmt_descriptor call_mgmt_descriptor = {
141 .bLength = sizeof call_mgmt_descriptor,
142 .bDescriptorType = USB_DT_CS_INTERFACE,
143 .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
145 .bmCapabilities = 0x00,
146 .bDataInterface = 0x01,
149 static struct usb_cdc_acm_descriptor rndis_acm_descriptor = {
150 .bLength = sizeof rndis_acm_descriptor,
151 .bDescriptorType = USB_DT_CS_INTERFACE,
152 .bDescriptorSubType = USB_CDC_ACM_TYPE,
154 .bmCapabilities = 0x00,
157 static struct usb_cdc_union_desc rndis_union_desc = {
158 .bLength = sizeof(rndis_union_desc),
159 .bDescriptorType = USB_DT_CS_INTERFACE,
160 .bDescriptorSubType = USB_CDC_UNION_TYPE,
161 /* .bMasterInterface0 = DYNAMIC */
162 /* .bSlaveInterface0 = DYNAMIC */
165 /* the data interface has two bulk endpoints */
167 static struct usb_interface_descriptor rndis_data_intf = {
168 .bLength = sizeof rndis_data_intf,
169 .bDescriptorType = USB_DT_INTERFACE,
171 /* .bInterfaceNumber = DYNAMIC */
173 .bInterfaceClass = USB_CLASS_CDC_DATA,
174 .bInterfaceSubClass = 0,
175 .bInterfaceProtocol = 0,
176 /* .iInterface = DYNAMIC */
180 static struct usb_interface_assoc_descriptor
181 rndis_iad_descriptor = {
182 .bLength = sizeof rndis_iad_descriptor,
183 .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
185 .bFirstInterface = 0, /* XXX, hardcoded */
186 .bInterfaceCount = 2, // control + data
187 .bFunctionClass = USB_CLASS_COMM,
188 .bFunctionSubClass = USB_CDC_SUBCLASS_ETHERNET,
189 .bFunctionProtocol = USB_CDC_PROTO_NONE,
190 /* .iFunction = DYNAMIC */
193 /* full speed support: */
195 static struct usb_endpoint_descriptor fs_notify_desc = {
196 .bLength = USB_DT_ENDPOINT_SIZE,
197 .bDescriptorType = USB_DT_ENDPOINT,
199 .bEndpointAddress = USB_DIR_IN,
200 .bmAttributes = USB_ENDPOINT_XFER_INT,
201 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
202 .bInterval = RNDIS_STATUS_INTERVAL_MS,
205 static struct usb_endpoint_descriptor fs_in_desc = {
206 .bLength = USB_DT_ENDPOINT_SIZE,
207 .bDescriptorType = USB_DT_ENDPOINT,
209 .bEndpointAddress = USB_DIR_IN,
210 .bmAttributes = USB_ENDPOINT_XFER_BULK,
213 static struct usb_endpoint_descriptor fs_out_desc = {
214 .bLength = USB_DT_ENDPOINT_SIZE,
215 .bDescriptorType = USB_DT_ENDPOINT,
217 .bEndpointAddress = USB_DIR_OUT,
218 .bmAttributes = USB_ENDPOINT_XFER_BULK,
221 static struct usb_descriptor_header *eth_fs_function[] = {
222 (struct usb_descriptor_header *) &rndis_iad_descriptor,
224 /* control interface matches ACM, not Ethernet */
225 (struct usb_descriptor_header *) &rndis_control_intf,
226 (struct usb_descriptor_header *) &header_desc,
227 (struct usb_descriptor_header *) &call_mgmt_descriptor,
228 (struct usb_descriptor_header *) &rndis_acm_descriptor,
229 (struct usb_descriptor_header *) &rndis_union_desc,
230 (struct usb_descriptor_header *) &fs_notify_desc,
232 /* data interface has no altsetting */
233 (struct usb_descriptor_header *) &rndis_data_intf,
234 (struct usb_descriptor_header *) &fs_in_desc,
235 (struct usb_descriptor_header *) &fs_out_desc,
239 /* high speed support: */
241 static struct usb_endpoint_descriptor hs_notify_desc = {
242 .bLength = USB_DT_ENDPOINT_SIZE,
243 .bDescriptorType = USB_DT_ENDPOINT,
245 .bEndpointAddress = USB_DIR_IN,
246 .bmAttributes = USB_ENDPOINT_XFER_INT,
247 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
248 .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS)
251 static struct usb_endpoint_descriptor hs_in_desc = {
252 .bLength = USB_DT_ENDPOINT_SIZE,
253 .bDescriptorType = USB_DT_ENDPOINT,
255 .bEndpointAddress = USB_DIR_IN,
256 .bmAttributes = USB_ENDPOINT_XFER_BULK,
257 .wMaxPacketSize = cpu_to_le16(512),
260 static struct usb_endpoint_descriptor hs_out_desc = {
261 .bLength = USB_DT_ENDPOINT_SIZE,
262 .bDescriptorType = USB_DT_ENDPOINT,
264 .bEndpointAddress = USB_DIR_OUT,
265 .bmAttributes = USB_ENDPOINT_XFER_BULK,
266 .wMaxPacketSize = cpu_to_le16(512),
269 static struct usb_descriptor_header *eth_hs_function[] = {
270 (struct usb_descriptor_header *) &rndis_iad_descriptor,
272 /* control interface matches ACM, not Ethernet */
273 (struct usb_descriptor_header *) &rndis_control_intf,
274 (struct usb_descriptor_header *) &header_desc,
275 (struct usb_descriptor_header *) &call_mgmt_descriptor,
276 (struct usb_descriptor_header *) &rndis_acm_descriptor,
277 (struct usb_descriptor_header *) &rndis_union_desc,
278 (struct usb_descriptor_header *) &hs_notify_desc,
280 /* data interface has no altsetting */
281 (struct usb_descriptor_header *) &rndis_data_intf,
282 (struct usb_descriptor_header *) &hs_in_desc,
283 (struct usb_descriptor_header *) &hs_out_desc,
287 /* super speed support: */
289 static struct usb_endpoint_descriptor ss_notify_desc = {
290 .bLength = USB_DT_ENDPOINT_SIZE,
291 .bDescriptorType = USB_DT_ENDPOINT,
293 .bEndpointAddress = USB_DIR_IN,
294 .bmAttributes = USB_ENDPOINT_XFER_INT,
295 .wMaxPacketSize = cpu_to_le16(STATUS_BYTECOUNT),
296 .bInterval = USB_MS_TO_HS_INTERVAL(RNDIS_STATUS_INTERVAL_MS)
299 static struct usb_ss_ep_comp_descriptor ss_intr_comp_desc = {
300 .bLength = sizeof ss_intr_comp_desc,
301 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
303 /* the following 3 values can be tweaked if necessary */
304 /* .bMaxBurst = 0, */
305 /* .bmAttributes = 0, */
306 .wBytesPerInterval = cpu_to_le16(STATUS_BYTECOUNT),
309 static struct usb_endpoint_descriptor ss_in_desc = {
310 .bLength = USB_DT_ENDPOINT_SIZE,
311 .bDescriptorType = USB_DT_ENDPOINT,
313 .bEndpointAddress = USB_DIR_IN,
314 .bmAttributes = USB_ENDPOINT_XFER_BULK,
315 .wMaxPacketSize = cpu_to_le16(1024),
318 static struct usb_endpoint_descriptor ss_out_desc = {
319 .bLength = USB_DT_ENDPOINT_SIZE,
320 .bDescriptorType = USB_DT_ENDPOINT,
322 .bEndpointAddress = USB_DIR_OUT,
323 .bmAttributes = USB_ENDPOINT_XFER_BULK,
324 .wMaxPacketSize = cpu_to_le16(1024),
327 static struct usb_ss_ep_comp_descriptor ss_bulk_comp_desc = {
328 .bLength = sizeof ss_bulk_comp_desc,
329 .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
331 /* the following 2 values can be tweaked if necessary */
332 /* .bMaxBurst = 0, */
333 /* .bmAttributes = 0, */
336 static struct usb_descriptor_header *eth_ss_function[] = {
337 (struct usb_descriptor_header *) &rndis_iad_descriptor,
339 /* control interface matches ACM, not Ethernet */
340 (struct usb_descriptor_header *) &rndis_control_intf,
341 (struct usb_descriptor_header *) &header_desc,
342 (struct usb_descriptor_header *) &call_mgmt_descriptor,
343 (struct usb_descriptor_header *) &rndis_acm_descriptor,
344 (struct usb_descriptor_header *) &rndis_union_desc,
345 (struct usb_descriptor_header *) &ss_notify_desc,
346 (struct usb_descriptor_header *) &ss_intr_comp_desc,
348 /* data interface has no altsetting */
349 (struct usb_descriptor_header *) &rndis_data_intf,
350 (struct usb_descriptor_header *) &ss_in_desc,
351 (struct usb_descriptor_header *) &ss_bulk_comp_desc,
352 (struct usb_descriptor_header *) &ss_out_desc,
353 (struct usb_descriptor_header *) &ss_bulk_comp_desc,
357 /* string descriptors: */
359 static struct usb_string rndis_string_defs[] = {
360 [0].s = "RNDIS Communications Control",
361 [1].s = "RNDIS Ethernet Data",
363 { } /* end of list */
366 static struct usb_gadget_strings rndis_string_table = {
367 .language = 0x0409, /* en-us */
368 .strings = rndis_string_defs,
371 static struct usb_gadget_strings *rndis_strings[] = {
376 /*-------------------------------------------------------------------------*/
378 static struct sk_buff *rndis_add_header(struct gether *port,
381 struct sk_buff *skb2;
383 skb2 = skb_realloc_headroom(skb, sizeof(struct rndis_packet_msg_type));
387 dev_kfree_skb_any(skb);
391 static void rndis_response_available(void *_rndis)
393 struct f_rndis *rndis = _rndis;
394 struct usb_request *req = rndis->notify_req;
395 struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
396 __le32 *data = req->buf;
399 if (atomic_inc_return(&rndis->notify_count) != 1)
402 /* Send RNDIS RESPONSE_AVAILABLE notification; a
403 * USB_CDC_NOTIFY_RESPONSE_AVAILABLE "should" work too
405 * This is the only notification defined by RNDIS.
407 data[0] = cpu_to_le32(1);
408 data[1] = cpu_to_le32(0);
410 status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
412 atomic_dec(&rndis->notify_count);
413 DBG(cdev, "notify/0 --> %d\n", status);
417 static void rndis_response_complete(struct usb_ep *ep, struct usb_request *req)
419 struct f_rndis *rndis = req->context;
420 struct usb_composite_dev *cdev = rndis->port.func.config->cdev;
421 int status = req->status;
424 * - USB_CDC_GET_ENCAPSULATED_RESPONSE (ep0/control)
425 * - RNDIS_RESPONSE_AVAILABLE (status/irq)
430 /* connection gone */
431 atomic_set(&rndis->notify_count, 0);
434 DBG(cdev, "RNDIS %s response error %d, %d/%d\n",
436 req->actual, req->length);
439 if (ep != rndis->notify)
442 /* handle multiple pending RNDIS_RESPONSE_AVAILABLE
443 * notifications by resending until we're done
445 if (atomic_dec_and_test(&rndis->notify_count))
447 status = usb_ep_queue(rndis->notify, req, GFP_ATOMIC);
449 atomic_dec(&rndis->notify_count);
450 DBG(cdev, "notify/1 --> %d\n", status);
456 static void rndis_command_complete(struct usb_ep *ep, struct usb_request *req)
458 struct f_rndis *rndis = req->context;
460 rndis_init_msg_type *buf;
462 /* received RNDIS command from USB_CDC_SEND_ENCAPSULATED_COMMAND */
463 // spin_lock(&dev->lock);
464 status = rndis_msg_parser(rndis->config, (u8 *) req->buf);
466 pr_err("RNDIS command error %d, %d/%d\n",
467 status, req->actual, req->length);
469 buf = (rndis_init_msg_type *)req->buf;
471 if (buf->MessageType == RNDIS_MSG_INIT) {
472 if (buf->MaxTransferSize > 2048)
473 rndis->port.multi_pkt_xfer = 1;
475 rndis->port.multi_pkt_xfer = 0;
476 DBG(cdev, "%s: MaxTransferSize: %d : Multi_pkt_txr: %s\n",
477 __func__, buf->MaxTransferSize,
478 rndis->port.multi_pkt_xfer ? "enabled" :
480 if (rndis_dl_max_pkt_per_xfer <= 1)
481 rndis->port.multi_pkt_xfer = 0;
483 // spin_unlock(&dev->lock);
487 rndis_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
489 struct f_rndis *rndis = func_to_rndis(f);
490 struct usb_composite_dev *cdev = f->config->cdev;
491 struct usb_request *req = cdev->req;
492 int value = -EOPNOTSUPP;
493 u16 w_index = le16_to_cpu(ctrl->wIndex);
494 u16 w_value = le16_to_cpu(ctrl->wValue);
495 u16 w_length = le16_to_cpu(ctrl->wLength);
497 /* composite driver infrastructure handles everything except
498 * CDC class messages; interface activation uses set_alt().
500 switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
502 /* RNDIS uses the CDC command encapsulation mechanism to implement
503 * an RPC scheme, with much getting/setting of attributes by OID.
505 case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
506 | USB_CDC_SEND_ENCAPSULATED_COMMAND:
507 if (w_value || w_index != rndis->ctrl_id)
509 /* read the request; process it later */
511 req->complete = rndis_command_complete;
512 req->context = rndis;
513 /* later, rndis_response_available() sends a notification */
516 case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
517 | USB_CDC_GET_ENCAPSULATED_RESPONSE:
518 if (w_value || w_index != rndis->ctrl_id)
524 /* return the result */
525 buf = rndis_get_next_response(rndis->config, &n);
527 memcpy(req->buf, buf, n);
528 req->complete = rndis_response_complete;
529 req->context = rndis;
530 rndis_free_response(rndis->config, buf);
533 /* else stalls ... spec says to avoid that */
539 VDBG(cdev, "invalid control req%02x.%02x v%04x i%04x l%d\n",
540 ctrl->bRequestType, ctrl->bRequest,
541 w_value, w_index, w_length);
544 /* respond with data transfer or status phase? */
546 DBG(cdev, "rndis req%02x.%02x v%04x i%04x l%d\n",
547 ctrl->bRequestType, ctrl->bRequest,
548 w_value, w_index, w_length);
549 req->zero = (value < w_length);
551 value = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
553 ERROR(cdev, "rndis response on err %d\n", value);
556 /* device either stalls (value < 0) or reports success */
561 static int rndis_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
563 struct f_rndis *rndis = func_to_rndis(f);
564 struct usb_composite_dev *cdev = f->config->cdev;
566 /* we know alt == 0 */
568 if (intf == rndis->ctrl_id) {
569 if (rndis->notify->driver_data) {
570 VDBG(cdev, "reset rndis control %d\n", intf);
571 usb_ep_disable(rndis->notify);
573 if (!rndis->notify->desc) {
574 VDBG(cdev, "init rndis ctrl %d\n", intf);
575 if (config_ep_by_speed(cdev->gadget, f, rndis->notify))
578 usb_ep_enable(rndis->notify);
579 rndis->notify->driver_data = rndis;
581 } else if (intf == rndis->data_id) {
582 struct net_device *net;
584 if (rndis->port.in_ep->driver_data) {
585 DBG(cdev, "reset rndis\n");
586 gether_disconnect(&rndis->port);
589 if (!rndis->port.in_ep->desc || !rndis->port.out_ep->desc) {
590 DBG(cdev, "init rndis\n");
591 if (config_ep_by_speed(cdev->gadget, f,
592 rndis->port.in_ep) ||
593 config_ep_by_speed(cdev->gadget, f,
594 rndis->port.out_ep)) {
595 rndis->port.in_ep->desc = NULL;
596 rndis->port.out_ep->desc = NULL;
601 /* Avoid ZLPs; they can be troublesome. */
602 rndis->port.is_zlp_ok = false;
604 /* RNDIS should be in the "RNDIS uninitialized" state,
605 * either never activated or after rndis_uninit().
607 * We don't want data to flow here until a nonzero packet
608 * filter is set, at which point it enters "RNDIS data
609 * initialized" state ... but we do want the endpoints
610 * to be activated. It's a strange little state.
612 * REVISIT the RNDIS gadget code has done this wrong for a
613 * very long time. We need another call to the link layer
614 * code -- gether_updown(...bool) maybe -- to do it right.
616 rndis->port.cdc_filter = 0;
618 DBG(cdev, "RNDIS RX/TX early activation ... \n");
619 net = gether_connect(&rndis->port);
623 rndis_set_param_dev(rndis->config, net,
624 &rndis->port.cdc_filter);
633 static void rndis_disable(struct usb_function *f)
635 struct f_rndis *rndis = func_to_rndis(f);
636 struct usb_composite_dev *cdev = f->config->cdev;
638 if (!rndis->notify->driver_data)
641 DBG(cdev, "rndis deactivated\n");
643 rndis_uninit(rndis->config);
644 gether_disconnect(&rndis->port);
646 usb_ep_disable(rndis->notify);
647 rndis->notify->driver_data = NULL;
650 /*-------------------------------------------------------------------------*/
653 * This isn't quite the same mechanism as CDC Ethernet, since the
654 * notification scheme passes less data, but the same set of link
655 * states must be tested. A key difference is that altsettings are
656 * not used to tell whether the link should send packets or not.
659 static void rndis_open(struct gether *geth)
661 struct f_rndis *rndis = func_to_rndis(&geth->func);
662 struct usb_composite_dev *cdev = geth->func.config->cdev;
664 DBG(cdev, "%s\n", __func__);
666 rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3,
667 bitrate(cdev->gadget) / 100);
668 rndis_signal_connect(rndis->config);
671 static void rndis_close(struct gether *geth)
673 struct f_rndis *rndis = func_to_rndis(&geth->func);
675 DBG(geth->func.config->cdev, "%s\n", __func__);
677 rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
678 rndis_signal_disconnect(rndis->config);
681 /*-------------------------------------------------------------------------*/
683 /* ethernet function driver setup/binding */
686 rndis_bind(struct usb_configuration *c, struct usb_function *f)
688 struct usb_composite_dev *cdev = c->cdev;
689 struct f_rndis *rndis = func_to_rndis(f);
693 /* allocate instance-specific interface IDs */
694 status = usb_interface_id(c, f);
697 rndis->ctrl_id = status;
698 rndis_iad_descriptor.bFirstInterface = status;
700 rndis_control_intf.bInterfaceNumber = status;
701 rndis_union_desc.bMasterInterface0 = status;
703 status = usb_interface_id(c, f);
706 rndis->data_id = status;
708 rndis_data_intf.bInterfaceNumber = status;
709 rndis_union_desc.bSlaveInterface0 = status;
713 /* allocate instance-specific endpoints */
714 ep = usb_ep_autoconfig(cdev->gadget, &fs_in_desc);
717 rndis->port.in_ep = ep;
718 ep->driver_data = cdev; /* claim */
720 ep = usb_ep_autoconfig(cdev->gadget, &fs_out_desc);
723 rndis->port.out_ep = ep;
724 ep->driver_data = cdev; /* claim */
726 /* NOTE: a status/notification endpoint is, strictly speaking,
727 * optional. We don't treat it that way though! It's simpler,
728 * and some newer profiles don't treat it as optional.
730 ep = usb_ep_autoconfig(cdev->gadget, &fs_notify_desc);
734 ep->driver_data = cdev; /* claim */
738 /* allocate notification request and buffer */
739 rndis->notify_req = usb_ep_alloc_request(ep, GFP_KERNEL);
740 if (!rndis->notify_req)
742 rndis->notify_req->buf = kmalloc(STATUS_BYTECOUNT, GFP_KERNEL);
743 if (!rndis->notify_req->buf)
745 rndis->notify_req->length = STATUS_BYTECOUNT;
746 rndis->notify_req->context = rndis;
747 rndis->notify_req->complete = rndis_response_complete;
749 /* support all relevant hardware speeds... we expect that when
750 * hardware is dual speed, all bulk-capable endpoints work at
753 hs_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress;
754 hs_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress;
755 hs_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress;
757 ss_in_desc.bEndpointAddress = fs_in_desc.bEndpointAddress;
758 ss_out_desc.bEndpointAddress = fs_out_desc.bEndpointAddress;
759 ss_notify_desc.bEndpointAddress = fs_notify_desc.bEndpointAddress;
761 status = usb_assign_descriptors(f, eth_fs_function, eth_hs_function,
766 rndis->port.open = rndis_open;
767 rndis->port.close = rndis_close;
769 status = rndis_register(rndis_response_available, rndis);
772 rndis->config = status;
774 rndis_set_param_medium(rndis->config, RNDIS_MEDIUM_802_3, 0);
775 rndis_set_host_mac(rndis->config, rndis->ethaddr);
776 rndis_set_max_pkt_xfer(rndis->config, rndis_ul_max_pkt_per_xfer);
778 if (rndis->manufacturer && rndis->vendorID &&
779 rndis_set_param_vendor(rndis->config, rndis->vendorID,
780 rndis->manufacturer))
783 /* NOTE: all that is done without knowing or caring about
784 * the network link ... which is unavailable to this code
785 * until we're activated via set_alt().
788 DBG(cdev, "RNDIS: %s speed IN/%s OUT/%s NOTIFY/%s\n",
789 gadget_is_superspeed(c->cdev->gadget) ? "super" :
790 gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full",
791 rndis->port.in_ep->name, rndis->port.out_ep->name,
792 rndis->notify->name);
796 usb_free_all_descriptors(f);
798 if (rndis->notify_req) {
799 kfree(rndis->notify_req->buf);
800 usb_ep_free_request(rndis->notify, rndis->notify_req);
803 /* we might as well release our claims on endpoints */
805 rndis->notify->driver_data = NULL;
806 if (rndis->port.out_ep)
807 rndis->port.out_ep->driver_data = NULL;
808 if (rndis->port.in_ep)
809 rndis->port.in_ep->driver_data = NULL;
811 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
817 rndis_unbind(struct usb_configuration *c, struct usb_function *f)
819 struct f_rndis *rndis = func_to_rndis(f);
821 rndis_deregister(rndis->config);
824 rndis_string_defs[0].id = 0;
825 usb_free_all_descriptors(f);
827 kfree(rndis->notify_req->buf);
828 usb_ep_free_request(rndis->notify, rndis->notify_req);
833 /* Some controllers can't support RNDIS ... */
834 static inline bool can_support_rndis(struct usb_configuration *c)
836 /* everything else is *presumably* fine */
841 rndis_bind_config_vendor(struct usb_configuration *c, u8 ethaddr[ETH_ALEN],
842 u32 vendorID, const char *manufacturer, struct eth_dev *dev)
844 struct f_rndis *rndis;
847 if (!can_support_rndis(c) || !ethaddr)
850 /* setup RNDIS itself */
851 status = rndis_init();
855 if (rndis_string_defs[0].id == 0) {
856 status = usb_string_ids_tab(c->cdev, rndis_string_defs);
860 rndis_control_intf.iInterface = rndis_string_defs[0].id;
861 rndis_data_intf.iInterface = rndis_string_defs[1].id;
862 rndis_iad_descriptor.iFunction = rndis_string_defs[2].id;
865 /* allocate and initialize one new instance */
867 rndis = kzalloc(sizeof *rndis, GFP_KERNEL);
871 memcpy(rndis->ethaddr, ethaddr, ETH_ALEN);
872 rndis->vendorID = vendorID;
873 rndis->manufacturer = manufacturer;
875 rndis->port.ioport = dev;
876 /* RNDIS activates when the host changes this filter */
877 rndis->port.cdc_filter = 0;
879 /* RNDIS has special (and complex) framing */
880 rndis->port.header_len = sizeof(struct rndis_packet_msg_type);
881 rndis->port.wrap = rndis_add_header;
882 rndis->port.unwrap = rndis_rm_hdr;
883 rndis->port.ul_max_pkts_per_xfer = rndis_ul_max_pkt_per_xfer;
884 rndis->port.dl_max_pkts_per_xfer = rndis_dl_max_pkt_per_xfer;
886 rndis->port.func.name = "rndis";
887 rndis->port.func.strings = rndis_strings;
888 /* descriptors are per-instance copies */
889 rndis->port.func.bind = rndis_bind;
890 rndis->port.func.unbind = rndis_unbind;
891 rndis->port.func.set_alt = rndis_set_alt;
892 rndis->port.func.setup = rndis_setup;
893 rndis->port.func.disable = rndis_disable;
895 status = usb_add_function(c, &rndis->port.func);