net: usbnet: support 64bit stats
[sfrench/cifs-2.6.git] / drivers / net / usb / rndis_host.c
1 /*
2  * Host Side support for RNDIS Networking Links
3  * Copyright (C) 2005 by David Brownell
4  *
5  * This program is free software; you can redistribute it and/or modify
6  * it under the terms of the GNU General Public License as published by
7  * the Free Software Foundation; either version 2 of the License, or
8  * (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
17  */
18 #include <linux/module.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/ethtool.h>
22 #include <linux/workqueue.h>
23 #include <linux/slab.h>
24 #include <linux/mii.h>
25 #include <linux/usb.h>
26 #include <linux/usb/cdc.h>
27 #include <linux/usb/usbnet.h>
28 #include <linux/usb/rndis_host.h>
29
30
31 /*
32  * RNDIS is NDIS remoted over USB.  It's a MSFT variant of CDC ACM ... of
33  * course ACM was intended for modems, not Ethernet links!  USB's standard
34  * for Ethernet links is "CDC Ethernet", which is significantly simpler.
35  *
36  * NOTE that Microsoft's "RNDIS 1.0" specification is incomplete.  Issues
37  * include:
38  *    - Power management in particular relies on information that's scattered
39  *      through other documentation, and which is incomplete or incorrect even
40  *      there.
41  *    - There are various undocumented protocol requirements, such as the
42  *      need to send unused garbage in control-OUT messages.
43  *    - In some cases, MS-Windows will emit undocumented requests; this
44  *      matters more to peripheral implementations than host ones.
45  *
46  * Moreover there's a no-open-specs variant of RNDIS called "ActiveSync".
47  *
48  * For these reasons and others, ** USE OF RNDIS IS STRONGLY DISCOURAGED ** in
49  * favor of such non-proprietary alternatives as CDC Ethernet or the newer (and
50  * currently rare) "Ethernet Emulation Model" (EEM).
51  */
52
53 /*
54  * RNDIS notifications from device: command completion; "reverse"
55  * keepalives; etc
56  */
57 void rndis_status(struct usbnet *dev, struct urb *urb)
58 {
59         netdev_dbg(dev->net, "rndis status urb, len %d stat %d\n",
60                    urb->actual_length, urb->status);
61         // FIXME for keepalives, respond immediately (asynchronously)
62         // if not an RNDIS status, do like cdc_status(dev,urb) does
63 }
64 EXPORT_SYMBOL_GPL(rndis_status);
65
66 /*
67  * RNDIS indicate messages.
68  */
69 static void rndis_msg_indicate(struct usbnet *dev, struct rndis_indicate *msg,
70                                 int buflen)
71 {
72         struct cdc_state *info = (void *)&dev->data;
73         struct device *udev = &info->control->dev;
74
75         if (dev->driver_info->indication) {
76                 dev->driver_info->indication(dev, msg, buflen);
77         } else {
78                 u32 status = le32_to_cpu(msg->status);
79
80                 switch (status) {
81                 case RNDIS_STATUS_MEDIA_CONNECT:
82                         dev_info(udev, "rndis media connect\n");
83                         break;
84                 case RNDIS_STATUS_MEDIA_DISCONNECT:
85                         dev_info(udev, "rndis media disconnect\n");
86                         break;
87                 default:
88                         dev_info(udev, "rndis indication: 0x%08x\n", status);
89                 }
90         }
91 }
92
93 /*
94  * RPC done RNDIS-style.  Caller guarantees:
95  * - message is properly byteswapped
96  * - there's no other request pending
97  * - buf can hold up to 1KB response (required by RNDIS spec)
98  * On return, the first few entries are already byteswapped.
99  *
100  * Call context is likely probe(), before interface name is known,
101  * which is why we won't try to use it in the diagnostics.
102  */
103 int rndis_command(struct usbnet *dev, struct rndis_msg_hdr *buf, int buflen)
104 {
105         struct cdc_state        *info = (void *) &dev->data;
106         struct usb_cdc_notification notification;
107         int                     master_ifnum;
108         int                     retval;
109         int                     partial;
110         unsigned                count;
111         u32                     xid = 0, msg_len, request_id, msg_type, rsp,
112                                 status;
113
114         /* REVISIT when this gets called from contexts other than probe() or
115          * disconnect(): either serialize, or dispatch responses on xid
116          */
117
118         msg_type = le32_to_cpu(buf->msg_type);
119
120         /* Issue the request; xid is unique, don't bother byteswapping it */
121         if (likely(msg_type != RNDIS_MSG_HALT && msg_type != RNDIS_MSG_RESET)) {
122                 xid = dev->xid++;
123                 if (!xid)
124                         xid = dev->xid++;
125                 buf->request_id = (__force __le32) xid;
126         }
127         master_ifnum = info->control->cur_altsetting->desc.bInterfaceNumber;
128         retval = usb_control_msg(dev->udev,
129                 usb_sndctrlpipe(dev->udev, 0),
130                 USB_CDC_SEND_ENCAPSULATED_COMMAND,
131                 USB_TYPE_CLASS | USB_RECIP_INTERFACE,
132                 0, master_ifnum,
133                 buf, le32_to_cpu(buf->msg_len),
134                 RNDIS_CONTROL_TIMEOUT_MS);
135         if (unlikely(retval < 0 || xid == 0))
136                 return retval;
137
138         /* Some devices don't respond on the control channel until
139          * polled on the status channel, so do that first. */
140         if (dev->driver_info->data & RNDIS_DRIVER_DATA_POLL_STATUS) {
141                 retval = usb_interrupt_msg(
142                         dev->udev,
143                         usb_rcvintpipe(dev->udev,
144                                        dev->status->desc.bEndpointAddress),
145                         &notification, sizeof(notification), &partial,
146                         RNDIS_CONTROL_TIMEOUT_MS);
147                 if (unlikely(retval < 0))
148                         return retval;
149         }
150
151         /* Poll the control channel; the request probably completed immediately */
152         rsp = le32_to_cpu(buf->msg_type) | RNDIS_MSG_COMPLETION;
153         for (count = 0; count < 10; count++) {
154                 memset(buf, 0, CONTROL_BUFFER_SIZE);
155                 retval = usb_control_msg(dev->udev,
156                         usb_rcvctrlpipe(dev->udev, 0),
157                         USB_CDC_GET_ENCAPSULATED_RESPONSE,
158                         USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
159                         0, master_ifnum,
160                         buf, buflen,
161                         RNDIS_CONTROL_TIMEOUT_MS);
162                 if (likely(retval >= 8)) {
163                         msg_type = le32_to_cpu(buf->msg_type);
164                         msg_len = le32_to_cpu(buf->msg_len);
165                         status = le32_to_cpu(buf->status);
166                         request_id = (__force u32) buf->request_id;
167                         if (likely(msg_type == rsp)) {
168                                 if (likely(request_id == xid)) {
169                                         if (unlikely(rsp == RNDIS_MSG_RESET_C))
170                                                 return 0;
171                                         if (likely(RNDIS_STATUS_SUCCESS ==
172                                                         status))
173                                                 return 0;
174                                         dev_dbg(&info->control->dev,
175                                                 "rndis reply status %08x\n",
176                                                 status);
177                                         return -EL3RST;
178                                 }
179                                 dev_dbg(&info->control->dev,
180                                         "rndis reply id %d expected %d\n",
181                                         request_id, xid);
182                                 /* then likely retry */
183                         } else switch (msg_type) {
184                         case RNDIS_MSG_INDICATE: /* fault/event */
185                                 rndis_msg_indicate(dev, (void *)buf, buflen);
186                                 break;
187                         case RNDIS_MSG_KEEPALIVE: { /* ping */
188                                 struct rndis_keepalive_c *msg = (void *)buf;
189
190                                 msg->msg_type = cpu_to_le32(RNDIS_MSG_KEEPALIVE_C);
191                                 msg->msg_len = cpu_to_le32(sizeof *msg);
192                                 msg->status = cpu_to_le32(RNDIS_STATUS_SUCCESS);
193                                 retval = usb_control_msg(dev->udev,
194                                         usb_sndctrlpipe(dev->udev, 0),
195                                         USB_CDC_SEND_ENCAPSULATED_COMMAND,
196                                         USB_TYPE_CLASS | USB_RECIP_INTERFACE,
197                                         0, master_ifnum,
198                                         msg, sizeof *msg,
199                                         RNDIS_CONTROL_TIMEOUT_MS);
200                                 if (unlikely(retval < 0))
201                                         dev_dbg(&info->control->dev,
202                                                 "rndis keepalive err %d\n",
203                                                 retval);
204                                 }
205                                 break;
206                         default:
207                                 dev_dbg(&info->control->dev,
208                                         "unexpected rndis msg %08x len %d\n",
209                                         le32_to_cpu(buf->msg_type), msg_len);
210                         }
211                 } else {
212                         /* device probably issued a protocol stall; ignore */
213                         dev_dbg(&info->control->dev,
214                                 "rndis response error, code %d\n", retval);
215                 }
216                 msleep(20);
217         }
218         dev_dbg(&info->control->dev, "rndis response timeout\n");
219         return -ETIMEDOUT;
220 }
221 EXPORT_SYMBOL_GPL(rndis_command);
222
223 /*
224  * rndis_query:
225  *
226  * Performs a query for @oid along with 0 or more bytes of payload as
227  * specified by @in_len. If @reply_len is not set to -1 then the reply
228  * length is checked against this value, resulting in an error if it
229  * doesn't match.
230  *
231  * NOTE: Adding a payload exactly or greater than the size of the expected
232  * response payload is an evident requirement MSFT added for ActiveSync.
233  *
234  * The only exception is for OIDs that return a variably sized response,
235  * in which case no payload should be added.  This undocumented (and
236  * nonsensical!) issue was found by sniffing protocol requests from the
237  * ActiveSync 4.1 Windows driver.
238  */
239 static int rndis_query(struct usbnet *dev, struct usb_interface *intf,
240                 void *buf, u32 oid, u32 in_len,
241                 void **reply, int *reply_len)
242 {
243         int retval;
244         union {
245                 void                    *buf;
246                 struct rndis_msg_hdr    *header;
247                 struct rndis_query      *get;
248                 struct rndis_query_c    *get_c;
249         } u;
250         u32 off, len;
251
252         u.buf = buf;
253
254         memset(u.get, 0, sizeof *u.get + in_len);
255         u.get->msg_type = cpu_to_le32(RNDIS_MSG_QUERY);
256         u.get->msg_len = cpu_to_le32(sizeof *u.get + in_len);
257         u.get->oid = cpu_to_le32(oid);
258         u.get->len = cpu_to_le32(in_len);
259         u.get->offset = cpu_to_le32(20);
260
261         retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
262         if (unlikely(retval < 0)) {
263                 dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) failed, %d\n",
264                                 oid, retval);
265                 return retval;
266         }
267
268         off = le32_to_cpu(u.get_c->offset);
269         len = le32_to_cpu(u.get_c->len);
270         if (unlikely((8 + off + len) > CONTROL_BUFFER_SIZE))
271                 goto response_error;
272
273         if (*reply_len != -1 && len != *reply_len)
274                 goto response_error;
275
276         *reply = (unsigned char *) &u.get_c->request_id + off;
277         *reply_len = len;
278
279         return retval;
280
281 response_error:
282         dev_err(&intf->dev, "RNDIS_MSG_QUERY(0x%08x) "
283                         "invalid response - off %d len %d\n",
284                 oid, off, len);
285         return -EDOM;
286 }
287
288 /* same as usbnet_netdev_ops but MTU change not allowed */
289 static const struct net_device_ops rndis_netdev_ops = {
290         .ndo_open               = usbnet_open,
291         .ndo_stop               = usbnet_stop,
292         .ndo_start_xmit         = usbnet_start_xmit,
293         .ndo_tx_timeout         = usbnet_tx_timeout,
294         .ndo_get_stats64        = usbnet_get_stats64,
295         .ndo_set_mac_address    = eth_mac_addr,
296         .ndo_validate_addr      = eth_validate_addr,
297 };
298
299 int
300 generic_rndis_bind(struct usbnet *dev, struct usb_interface *intf, int flags)
301 {
302         int                     retval;
303         struct net_device       *net = dev->net;
304         struct cdc_state        *info = (void *) &dev->data;
305         union {
306                 void                    *buf;
307                 struct rndis_msg_hdr    *header;
308                 struct rndis_init       *init;
309                 struct rndis_init_c     *init_c;
310                 struct rndis_query      *get;
311                 struct rndis_query_c    *get_c;
312                 struct rndis_set        *set;
313                 struct rndis_set_c      *set_c;
314                 struct rndis_halt       *halt;
315         } u;
316         u32                     tmp;
317         __le32                  phym_unspec, *phym;
318         int                     reply_len;
319         unsigned char           *bp;
320
321         /* we can't rely on i/o from stack working, or stack allocation */
322         u.buf = kmalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
323         if (!u.buf)
324                 return -ENOMEM;
325         retval = usbnet_generic_cdc_bind(dev, intf);
326         if (retval < 0)
327                 goto fail;
328
329         u.init->msg_type = cpu_to_le32(RNDIS_MSG_INIT);
330         u.init->msg_len = cpu_to_le32(sizeof *u.init);
331         u.init->major_version = cpu_to_le32(1);
332         u.init->minor_version = cpu_to_le32(0);
333
334         /* max transfer (in spec) is 0x4000 at full speed, but for
335          * TX we'll stick to one Ethernet packet plus RNDIS framing.
336          * For RX we handle drivers that zero-pad to end-of-packet.
337          * Don't let userspace change these settings.
338          *
339          * NOTE: there still seems to be wierdness here, as if we need
340          * to do some more things to make sure WinCE targets accept this.
341          * They default to jumbograms of 8KB or 16KB, which is absurd
342          * for such low data rates and which is also more than Linux
343          * can usually expect to allocate for SKB data...
344          */
345         net->hard_header_len += sizeof (struct rndis_data_hdr);
346         dev->hard_mtu = net->mtu + net->hard_header_len;
347
348         dev->maxpacket = usb_maxpacket(dev->udev, dev->out, 1);
349         if (dev->maxpacket == 0) {
350                 netif_dbg(dev, probe, dev->net,
351                           "dev->maxpacket can't be 0\n");
352                 retval = -EINVAL;
353                 goto fail_and_release;
354         }
355
356         dev->rx_urb_size = dev->hard_mtu + (dev->maxpacket + 1);
357         dev->rx_urb_size &= ~(dev->maxpacket - 1);
358         u.init->max_transfer_size = cpu_to_le32(dev->rx_urb_size);
359
360         net->netdev_ops = &rndis_netdev_ops;
361
362         retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
363         if (unlikely(retval < 0)) {
364                 /* it might not even be an RNDIS device!! */
365                 dev_err(&intf->dev, "RNDIS init failed, %d\n", retval);
366                 goto fail_and_release;
367         }
368         tmp = le32_to_cpu(u.init_c->max_transfer_size);
369         if (tmp < dev->hard_mtu) {
370                 if (tmp <= net->hard_header_len) {
371                         dev_err(&intf->dev,
372                                 "dev can't take %u byte packets (max %u)\n",
373                                 dev->hard_mtu, tmp);
374                         retval = -EINVAL;
375                         goto halt_fail_and_release;
376                 }
377                 dev_warn(&intf->dev,
378                          "dev can't take %u byte packets (max %u), "
379                          "adjusting MTU to %u\n",
380                          dev->hard_mtu, tmp, tmp - net->hard_header_len);
381                 dev->hard_mtu = tmp;
382                 net->mtu = dev->hard_mtu - net->hard_header_len;
383         }
384
385         /* REVISIT:  peripheral "alignment" request is ignored ... */
386         dev_dbg(&intf->dev,
387                 "hard mtu %u (%u from dev), rx buflen %zu, align %d\n",
388                 dev->hard_mtu, tmp, dev->rx_urb_size,
389                 1 << le32_to_cpu(u.init_c->packet_alignment));
390
391         /* module has some device initialization code needs to be done right
392          * after RNDIS_INIT */
393         if (dev->driver_info->early_init &&
394                         dev->driver_info->early_init(dev) != 0)
395                 goto halt_fail_and_release;
396
397         /* Check physical medium */
398         phym = NULL;
399         reply_len = sizeof *phym;
400         retval = rndis_query(dev, intf, u.buf,
401                              RNDIS_OID_GEN_PHYSICAL_MEDIUM,
402                              0, (void **) &phym, &reply_len);
403         if (retval != 0 || !phym) {
404                 /* OID is optional so don't fail here. */
405                 phym_unspec = cpu_to_le32(RNDIS_PHYSICAL_MEDIUM_UNSPECIFIED);
406                 phym = &phym_unspec;
407         }
408         if ((flags & FLAG_RNDIS_PHYM_WIRELESS) &&
409             le32_to_cpup(phym) != RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
410                 netif_dbg(dev, probe, dev->net,
411                           "driver requires wireless physical medium, but device is not\n");
412                 retval = -ENODEV;
413                 goto halt_fail_and_release;
414         }
415         if ((flags & FLAG_RNDIS_PHYM_NOT_WIRELESS) &&
416             le32_to_cpup(phym) == RNDIS_PHYSICAL_MEDIUM_WIRELESS_LAN) {
417                 netif_dbg(dev, probe, dev->net,
418                           "driver requires non-wireless physical medium, but device is wireless.\n");
419                 retval = -ENODEV;
420                 goto halt_fail_and_release;
421         }
422
423         /* Get designated host ethernet address */
424         reply_len = ETH_ALEN;
425         retval = rndis_query(dev, intf, u.buf,
426                              RNDIS_OID_802_3_PERMANENT_ADDRESS,
427                              48, (void **) &bp, &reply_len);
428         if (unlikely(retval< 0)) {
429                 dev_err(&intf->dev, "rndis get ethaddr, %d\n", retval);
430                 goto halt_fail_and_release;
431         }
432
433         if (bp[0] & 0x02)
434                 eth_hw_addr_random(net);
435         else
436                 ether_addr_copy(net->dev_addr, bp);
437
438         /* set a nonzero filter to enable data transfers */
439         memset(u.set, 0, sizeof *u.set);
440         u.set->msg_type = cpu_to_le32(RNDIS_MSG_SET);
441         u.set->msg_len = cpu_to_le32(4 + sizeof *u.set);
442         u.set->oid = cpu_to_le32(RNDIS_OID_GEN_CURRENT_PACKET_FILTER);
443         u.set->len = cpu_to_le32(4);
444         u.set->offset = cpu_to_le32((sizeof *u.set) - 8);
445         *(__le32 *)(u.buf + sizeof *u.set) = cpu_to_le32(RNDIS_DEFAULT_FILTER);
446
447         retval = rndis_command(dev, u.header, CONTROL_BUFFER_SIZE);
448         if (unlikely(retval < 0)) {
449                 dev_err(&intf->dev, "rndis set packet filter, %d\n", retval);
450                 goto halt_fail_and_release;
451         }
452
453         retval = 0;
454
455         kfree(u.buf);
456         return retval;
457
458 halt_fail_and_release:
459         memset(u.halt, 0, sizeof *u.halt);
460         u.halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
461         u.halt->msg_len = cpu_to_le32(sizeof *u.halt);
462         (void) rndis_command(dev, (void *)u.halt, CONTROL_BUFFER_SIZE);
463 fail_and_release:
464         usb_set_intfdata(info->data, NULL);
465         usb_driver_release_interface(driver_of(intf), info->data);
466         info->data = NULL;
467 fail:
468         kfree(u.buf);
469         return retval;
470 }
471 EXPORT_SYMBOL_GPL(generic_rndis_bind);
472
473 static int rndis_bind(struct usbnet *dev, struct usb_interface *intf)
474 {
475         return generic_rndis_bind(dev, intf, FLAG_RNDIS_PHYM_NOT_WIRELESS);
476 }
477
478 void rndis_unbind(struct usbnet *dev, struct usb_interface *intf)
479 {
480         struct rndis_halt       *halt;
481
482         /* try to clear any rndis state/activity (no i/o from stack!) */
483         halt = kzalloc(CONTROL_BUFFER_SIZE, GFP_KERNEL);
484         if (halt) {
485                 halt->msg_type = cpu_to_le32(RNDIS_MSG_HALT);
486                 halt->msg_len = cpu_to_le32(sizeof *halt);
487                 (void) rndis_command(dev, (void *)halt, CONTROL_BUFFER_SIZE);
488                 kfree(halt);
489         }
490
491         usbnet_cdc_unbind(dev, intf);
492 }
493 EXPORT_SYMBOL_GPL(rndis_unbind);
494
495 /*
496  * DATA -- host must not write zlps
497  */
498 int rndis_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
499 {
500         /* This check is no longer done by usbnet */
501         if (skb->len < dev->net->hard_header_len)
502                 return 0;
503
504         /* peripheral may have batched packets to us... */
505         while (likely(skb->len)) {
506                 struct rndis_data_hdr   *hdr = (void *)skb->data;
507                 struct sk_buff          *skb2;
508                 u32                     msg_type, msg_len, data_offset, data_len;
509
510                 msg_type = le32_to_cpu(hdr->msg_type);
511                 msg_len = le32_to_cpu(hdr->msg_len);
512                 data_offset = le32_to_cpu(hdr->data_offset);
513                 data_len = le32_to_cpu(hdr->data_len);
514
515                 /* don't choke if we see oob, per-packet data, etc */
516                 if (unlikely(msg_type != RNDIS_MSG_PACKET || skb->len < msg_len
517                                 || (data_offset + data_len + 8) > msg_len)) {
518                         dev->net->stats.rx_frame_errors++;
519                         netdev_dbg(dev->net, "bad rndis message %d/%d/%d/%d, len %d\n",
520                                    le32_to_cpu(hdr->msg_type),
521                                    msg_len, data_offset, data_len, skb->len);
522                         return 0;
523                 }
524                 skb_pull(skb, 8 + data_offset);
525
526                 /* at most one packet left? */
527                 if (likely((data_len - skb->len) <= sizeof *hdr)) {
528                         skb_trim(skb, data_len);
529                         break;
530                 }
531
532                 /* try to return all the packets in the batch */
533                 skb2 = skb_clone(skb, GFP_ATOMIC);
534                 if (unlikely(!skb2))
535                         break;
536                 skb_pull(skb, msg_len - sizeof *hdr);
537                 skb_trim(skb2, data_len);
538                 usbnet_skb_return(dev, skb2);
539         }
540
541         /* caller will usbnet_skb_return the remaining packet */
542         return 1;
543 }
544 EXPORT_SYMBOL_GPL(rndis_rx_fixup);
545
546 struct sk_buff *
547 rndis_tx_fixup(struct usbnet *dev, struct sk_buff *skb, gfp_t flags)
548 {
549         struct rndis_data_hdr   *hdr;
550         struct sk_buff          *skb2;
551         unsigned                len = skb->len;
552
553         if (likely(!skb_cloned(skb))) {
554                 int     room = skb_headroom(skb);
555
556                 /* enough head room as-is? */
557                 if (unlikely((sizeof *hdr) <= room))
558                         goto fill;
559
560                 /* enough room, but needs to be readjusted? */
561                 room += skb_tailroom(skb);
562                 if (likely((sizeof *hdr) <= room)) {
563                         skb->data = memmove(skb->head + sizeof *hdr,
564                                             skb->data, len);
565                         skb_set_tail_pointer(skb, len);
566                         goto fill;
567                 }
568         }
569
570         /* create a new skb, with the correct size (and tailpad) */
571         skb2 = skb_copy_expand(skb, sizeof *hdr, 1, flags);
572         dev_kfree_skb_any(skb);
573         if (unlikely(!skb2))
574                 return skb2;
575         skb = skb2;
576
577         /* fill out the RNDIS header.  we won't bother trying to batch
578          * packets; Linux minimizes wasted bandwidth through tx queues.
579          */
580 fill:
581         hdr = (void *) __skb_push(skb, sizeof *hdr);
582         memset(hdr, 0, sizeof *hdr);
583         hdr->msg_type = cpu_to_le32(RNDIS_MSG_PACKET);
584         hdr->msg_len = cpu_to_le32(skb->len);
585         hdr->data_offset = cpu_to_le32(sizeof(*hdr) - 8);
586         hdr->data_len = cpu_to_le32(len);
587
588         /* FIXME make the last packet always be short ... */
589         return skb;
590 }
591 EXPORT_SYMBOL_GPL(rndis_tx_fixup);
592
593
594 static const struct driver_info rndis_info = {
595         .description =  "RNDIS device",
596         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
597         .bind =         rndis_bind,
598         .unbind =       rndis_unbind,
599         .status =       rndis_status,
600         .rx_fixup =     rndis_rx_fixup,
601         .tx_fixup =     rndis_tx_fixup,
602 };
603
604 static const struct driver_info rndis_poll_status_info = {
605         .description =  "RNDIS device (poll status before control)",
606         .flags =        FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_FRAMING_RN | FLAG_NO_SETINT,
607         .data =         RNDIS_DRIVER_DATA_POLL_STATUS,
608         .bind =         rndis_bind,
609         .unbind =       rndis_unbind,
610         .status =       rndis_status,
611         .rx_fixup =     rndis_rx_fixup,
612         .tx_fixup =     rndis_tx_fixup,
613 };
614
615 /*-------------------------------------------------------------------------*/
616
617 static const struct usb_device_id       products [] = {
618 {
619         /* 2Wire HomePortal 1000SW */
620         USB_DEVICE_AND_INTERFACE_INFO(0x1630, 0x0042,
621                                       USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
622         .driver_info = (unsigned long) &rndis_poll_status_info,
623 }, {
624         /* RNDIS is MSFT's un-official variant of CDC ACM */
625         USB_INTERFACE_INFO(USB_CLASS_COMM, 2 /* ACM */, 0x0ff),
626         .driver_info = (unsigned long) &rndis_info,
627 }, {
628         /* "ActiveSync" is an undocumented variant of RNDIS, used in WM5 */
629         USB_INTERFACE_INFO(USB_CLASS_MISC, 1, 1),
630         .driver_info = (unsigned long) &rndis_poll_status_info,
631 }, {
632         /* RNDIS for tethering */
633         USB_INTERFACE_INFO(USB_CLASS_WIRELESS_CONTROLLER, 1, 3),
634         .driver_info = (unsigned long) &rndis_info,
635 },
636         { },            // END
637 };
638 MODULE_DEVICE_TABLE(usb, products);
639
640 static struct usb_driver rndis_driver = {
641         .name =         "rndis_host",
642         .id_table =     products,
643         .probe =        usbnet_probe,
644         .disconnect =   usbnet_disconnect,
645         .suspend =      usbnet_suspend,
646         .resume =       usbnet_resume,
647         .disable_hub_initiated_lpm = 1,
648 };
649
650 module_usb_driver(rndis_driver);
651
652 MODULE_AUTHOR("David Brownell");
653 MODULE_DESCRIPTION("USB Host side RNDIS driver");
654 MODULE_LICENSE("GPL");