1 /*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
21 #include <linux/kernel.h>
22 #include <linux/sched.h>
23 #include <linux/wait.h>
24 #include <linux/highmem.h>
25 #include <linux/slab.h>
26 #include <linux/io.h>
27 #include <linux/if_ether.h>
28 #include <linux/netdevice.h>
29 #include <linux/if_vlan.h>
30
31 #include "hyperv_net.h"
32
33
34 struct rndis_request {
35 struct list_head list_ent;
36 struct completion wait_event;
37
38 /*
39 * FIXME: We assumed a fixed size response here. If we do ever need to
40 * handle a bigger response, we can either define a max response
41 * message or add a response buffer variable above this field
42 */
43 struct rndis_message response_msg;
44
45 /* Simplify allocation by having a netvsc packet inline */
46 struct hv_netvsc_packet pkt;
47 struct hv_page_buffer buf;
48 /* FIXME: We assumed a fixed size request here. */
49 struct rndis_message request_msg;
50 };
51
52 static void rndis_filter_send_completion(void *ctx);
53
54 static void rndis_filter_send_request_completion(void *ctx);
55
56
57
get_rndis_device(void)58 static struct rndis_device *get_rndis_device(void)
59 {
60 struct rndis_device *device;
61
62 device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
63 if (!device)
64 return NULL;
65
66 spin_lock_init(&device->request_lock);
67
68 INIT_LIST_HEAD(&device->req_list);
69
70 device->state = RNDIS_DEV_UNINITIALIZED;
71
72 return device;
73 }
74
get_rndis_request(struct rndis_device * dev,u32 msg_type,u32 msg_len)75 static struct rndis_request *get_rndis_request(struct rndis_device *dev,
76 u32 msg_type,
77 u32 msg_len)
78 {
79 struct rndis_request *request;
80 struct rndis_message *rndis_msg;
81 struct rndis_set_request *set;
82 unsigned long flags;
83
84 request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
85 if (!request)
86 return NULL;
87
88 init_completion(&request->wait_event);
89
90 rndis_msg = &request->request_msg;
91 rndis_msg->ndis_msg_type = msg_type;
92 rndis_msg->msg_len = msg_len;
93
94 /*
95 * Set the request id. This field is always after the rndis header for
96 * request/response packet types so we just used the SetRequest as a
97 * template
98 */
99 set = &rndis_msg->msg.set_req;
100 set->req_id = atomic_inc_return(&dev->new_req_id);
101
102 /* Add to the request list */
103 spin_lock_irqsave(&dev->request_lock, flags);
104 list_add_tail(&request->list_ent, &dev->req_list);
105 spin_unlock_irqrestore(&dev->request_lock, flags);
106
107 return request;
108 }
109
put_rndis_request(struct rndis_device * dev,struct rndis_request * req)110 static void put_rndis_request(struct rndis_device *dev,
111 struct rndis_request *req)
112 {
113 unsigned long flags;
114
115 spin_lock_irqsave(&dev->request_lock, flags);
116 list_del(&req->list_ent);
117 spin_unlock_irqrestore(&dev->request_lock, flags);
118
119 kfree(req);
120 }
121
dump_rndis_message(struct hv_device * hv_dev,struct rndis_message * rndis_msg)122 static void dump_rndis_message(struct hv_device *hv_dev,
123 struct rndis_message *rndis_msg)
124 {
125 struct net_device *netdev;
126 struct netvsc_device *net_device;
127
128 net_device = hv_get_drvdata(hv_dev);
129 netdev = net_device->ndev;
130
131 switch (rndis_msg->ndis_msg_type) {
132 case REMOTE_NDIS_PACKET_MSG:
133 netdev_dbg(netdev, "REMOTE_NDIS_PACKET_MSG (len %u, "
134 "data offset %u data len %u, # oob %u, "
135 "oob offset %u, oob len %u, pkt offset %u, "
136 "pkt len %u\n",
137 rndis_msg->msg_len,
138 rndis_msg->msg.pkt.data_offset,
139 rndis_msg->msg.pkt.data_len,
140 rndis_msg->msg.pkt.num_oob_data_elements,
141 rndis_msg->msg.pkt.oob_data_offset,
142 rndis_msg->msg.pkt.oob_data_len,
143 rndis_msg->msg.pkt.per_pkt_info_offset,
144 rndis_msg->msg.pkt.per_pkt_info_len);
145 break;
146
147 case REMOTE_NDIS_INITIALIZE_CMPLT:
148 netdev_dbg(netdev, "REMOTE_NDIS_INITIALIZE_CMPLT "
149 "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
150 "device flags %d, max xfer size 0x%x, max pkts %u, "
151 "pkt aligned %u)\n",
152 rndis_msg->msg_len,
153 rndis_msg->msg.init_complete.req_id,
154 rndis_msg->msg.init_complete.status,
155 rndis_msg->msg.init_complete.major_ver,
156 rndis_msg->msg.init_complete.minor_ver,
157 rndis_msg->msg.init_complete.dev_flags,
158 rndis_msg->msg.init_complete.max_xfer_size,
159 rndis_msg->msg.init_complete.
160 max_pkt_per_msg,
161 rndis_msg->msg.init_complete.
162 pkt_alignment_factor);
163 break;
164
165 case REMOTE_NDIS_QUERY_CMPLT:
166 netdev_dbg(netdev, "REMOTE_NDIS_QUERY_CMPLT "
167 "(len %u, id 0x%x, status 0x%x, buf len %u, "
168 "buf offset %u)\n",
169 rndis_msg->msg_len,
170 rndis_msg->msg.query_complete.req_id,
171 rndis_msg->msg.query_complete.status,
172 rndis_msg->msg.query_complete.
173 info_buflen,
174 rndis_msg->msg.query_complete.
175 info_buf_offset);
176 break;
177
178 case REMOTE_NDIS_SET_CMPLT:
179 netdev_dbg(netdev,
180 "REMOTE_NDIS_SET_CMPLT (len %u, id 0x%x, status 0x%x)\n",
181 rndis_msg->msg_len,
182 rndis_msg->msg.set_complete.req_id,
183 rndis_msg->msg.set_complete.status);
184 break;
185
186 case REMOTE_NDIS_INDICATE_STATUS_MSG:
187 netdev_dbg(netdev, "REMOTE_NDIS_INDICATE_STATUS_MSG "
188 "(len %u, status 0x%x, buf len %u, buf offset %u)\n",
189 rndis_msg->msg_len,
190 rndis_msg->msg.indicate_status.status,
191 rndis_msg->msg.indicate_status.status_buflen,
192 rndis_msg->msg.indicate_status.status_buf_offset);
193 break;
194
195 default:
196 netdev_dbg(netdev, "0x%x (len %u)\n",
197 rndis_msg->ndis_msg_type,
198 rndis_msg->msg_len);
199 break;
200 }
201 }
202
rndis_filter_send_request(struct rndis_device * dev,struct rndis_request * req)203 static int rndis_filter_send_request(struct rndis_device *dev,
204 struct rndis_request *req)
205 {
206 int ret;
207 struct hv_netvsc_packet *packet;
208
209 /* Setup the packet to send it */
210 packet = &req->pkt;
211
212 packet->is_data_pkt = false;
213 packet->total_data_buflen = req->request_msg.msg_len;
214 packet->page_buf_cnt = 1;
215
216 packet->page_buf[0].pfn = virt_to_phys(&req->request_msg) >>
217 PAGE_SHIFT;
218 packet->page_buf[0].len = req->request_msg.msg_len;
219 packet->page_buf[0].offset =
220 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
221
222 packet->completion.send.send_completion_ctx = req;/* packet; */
223 packet->completion.send.send_completion =
224 rndis_filter_send_request_completion;
225 packet->completion.send.send_completion_tid = (unsigned long)dev;
226
227 ret = netvsc_send(dev->net_dev->dev, packet);
228 return ret;
229 }
230
rndis_filter_receive_response(struct rndis_device * dev,struct rndis_message * resp)231 static void rndis_filter_receive_response(struct rndis_device *dev,
232 struct rndis_message *resp)
233 {
234 struct rndis_request *request = NULL;
235 bool found = false;
236 unsigned long flags;
237 struct net_device *ndev;
238
239 ndev = dev->net_dev->ndev;
240
241 spin_lock_irqsave(&dev->request_lock, flags);
242 list_for_each_entry(request, &dev->req_list, list_ent) {
243 /*
244 * All request/response message contains RequestId as the 1st
245 * field
246 */
247 if (request->request_msg.msg.init_req.req_id
248 == resp->msg.init_complete.req_id) {
249 found = true;
250 break;
251 }
252 }
253 spin_unlock_irqrestore(&dev->request_lock, flags);
254
255 if (found) {
256 if (resp->msg_len <= sizeof(struct rndis_message)) {
257 memcpy(&request->response_msg, resp,
258 resp->msg_len);
259 } else {
260 netdev_err(ndev,
261 "rndis response buffer overflow "
262 "detected (size %u max %zu)\n",
263 resp->msg_len,
264 sizeof(struct rndis_filter_packet));
265
266 if (resp->ndis_msg_type ==
267 REMOTE_NDIS_RESET_CMPLT) {
268 /* does not have a request id field */
269 request->response_msg.msg.reset_complete.
270 status = STATUS_BUFFER_OVERFLOW;
271 } else {
272 request->response_msg.msg.
273 init_complete.status =
274 STATUS_BUFFER_OVERFLOW;
275 }
276 }
277
278 complete(&request->wait_event);
279 } else {
280 netdev_err(ndev,
281 "no rndis request found for this response "
282 "(id 0x%x res type 0x%x)\n",
283 resp->msg.init_complete.req_id,
284 resp->ndis_msg_type);
285 }
286 }
287
rndis_filter_receive_indicate_status(struct rndis_device * dev,struct rndis_message * resp)288 static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
289 struct rndis_message *resp)
290 {
291 struct rndis_indicate_status *indicate =
292 &resp->msg.indicate_status;
293
294 if (indicate->status == RNDIS_STATUS_MEDIA_CONNECT) {
295 netvsc_linkstatus_callback(
296 dev->net_dev->dev, 1);
297 } else if (indicate->status == RNDIS_STATUS_MEDIA_DISCONNECT) {
298 netvsc_linkstatus_callback(
299 dev->net_dev->dev, 0);
300 } else {
301 /*
302 * TODO:
303 */
304 }
305 }
306
307 /*
308 * Get the Per-Packet-Info with the specified type
309 * return NULL if not found.
310 */
rndis_get_ppi(struct rndis_packet * rpkt,u32 type)311 static inline void *rndis_get_ppi(struct rndis_packet *rpkt, u32 type)
312 {
313 struct rndis_per_packet_info *ppi;
314 int len;
315
316 if (rpkt->per_pkt_info_offset == 0)
317 return NULL;
318
319 ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
320 rpkt->per_pkt_info_offset);
321 len = rpkt->per_pkt_info_len;
322
323 while (len > 0) {
324 if (ppi->type == type)
325 return (void *)((ulong)ppi + ppi->ppi_offset);
326 len -= ppi->size;
327 ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
328 }
329
330 return NULL;
331 }
332
rndis_filter_receive_data(struct rndis_device * dev,struct rndis_message * msg,struct hv_netvsc_packet * pkt)333 static void rndis_filter_receive_data(struct rndis_device *dev,
334 struct rndis_message *msg,
335 struct hv_netvsc_packet *pkt)
336 {
337 struct rndis_packet *rndis_pkt;
338 u32 data_offset;
339 struct ndis_pkt_8021q_info *vlan;
340
341 rndis_pkt = &msg->msg.pkt;
342
343 /*
344 * FIXME: Handle multiple rndis pkt msgs that maybe enclosed in this
345 * netvsc packet (ie TotalDataBufferLength != MessageLength)
346 */
347
348 /* Remove the rndis header and pass it back up the stack */
349 data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
350
351 pkt->total_data_buflen -= data_offset;
352
353 /*
354 * Make sure we got a valid RNDIS message, now total_data_buflen
355 * should be the data packet size plus the trailer padding size
356 */
357 if (pkt->total_data_buflen < rndis_pkt->data_len) {
358 netdev_err(dev->net_dev->ndev, "rndis message buffer "
359 "overflow detected (got %u, min %u)"
360 "...dropping this message!\n",
361 pkt->total_data_buflen, rndis_pkt->data_len);
362 return;
363 }
364
365 /*
366 * Remove the rndis trailer padding from rndis packet message
367 * rndis_pkt->data_len tell us the real data length, we only copy
368 * the data packet to the stack, without the rndis trailer padding
369 */
370 pkt->total_data_buflen = rndis_pkt->data_len;
371 pkt->data = (void *)((unsigned long)pkt->data + data_offset);
372
373 pkt->is_data_pkt = true;
374
375 vlan = rndis_get_ppi(rndis_pkt, IEEE_8021Q_INFO);
376 if (vlan) {
377 pkt->vlan_tci = VLAN_TAG_PRESENT | vlan->vlanid |
378 (vlan->pri << VLAN_PRIO_SHIFT);
379 } else {
380 pkt->vlan_tci = 0;
381 }
382
383 netvsc_recv_callback(dev->net_dev->dev, pkt);
384 }
385
rndis_filter_receive(struct hv_device * dev,struct hv_netvsc_packet * pkt)386 int rndis_filter_receive(struct hv_device *dev,
387 struct hv_netvsc_packet *pkt)
388 {
389 struct netvsc_device *net_dev = hv_get_drvdata(dev);
390 struct rndis_device *rndis_dev;
391 struct rndis_message *rndis_msg;
392 struct net_device *ndev;
393
394 if (!net_dev)
395 return -EINVAL;
396
397 ndev = net_dev->ndev;
398
399 /* Make sure the rndis device state is initialized */
400 if (!net_dev->extension) {
401 netdev_err(ndev, "got rndis message but no rndis device - "
402 "dropping this message!\n");
403 return -ENODEV;
404 }
405
406 rndis_dev = (struct rndis_device *)net_dev->extension;
407 if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
408 netdev_err(ndev, "got rndis message but rndis device "
409 "uninitialized...dropping this message!\n");
410 return -ENODEV;
411 }
412
413 rndis_msg = pkt->data;
414
415 dump_rndis_message(dev, rndis_msg);
416
417 switch (rndis_msg->ndis_msg_type) {
418 case REMOTE_NDIS_PACKET_MSG:
419 /* data msg */
420 rndis_filter_receive_data(rndis_dev, rndis_msg, pkt);
421 break;
422
423 case REMOTE_NDIS_INITIALIZE_CMPLT:
424 case REMOTE_NDIS_QUERY_CMPLT:
425 case REMOTE_NDIS_SET_CMPLT:
426 /* completion msgs */
427 rndis_filter_receive_response(rndis_dev, rndis_msg);
428 break;
429
430 case REMOTE_NDIS_INDICATE_STATUS_MSG:
431 /* notification msgs */
432 rndis_filter_receive_indicate_status(rndis_dev, rndis_msg);
433 break;
434 default:
435 netdev_err(ndev,
436 "unhandled rndis message (type %u len %u)\n",
437 rndis_msg->ndis_msg_type,
438 rndis_msg->msg_len);
439 break;
440 }
441
442 return 0;
443 }
444
rndis_filter_query_device(struct rndis_device * dev,u32 oid,void * result,u32 * result_size)445 static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
446 void *result, u32 *result_size)
447 {
448 struct rndis_request *request;
449 u32 inresult_size = *result_size;
450 struct rndis_query_request *query;
451 struct rndis_query_complete *query_complete;
452 int ret = 0;
453 int t;
454
455 if (!result)
456 return -EINVAL;
457
458 *result_size = 0;
459 request = get_rndis_request(dev, REMOTE_NDIS_QUERY_MSG,
460 RNDIS_MESSAGE_SIZE(struct rndis_query_request));
461 if (!request) {
462 ret = -ENOMEM;
463 goto cleanup;
464 }
465
466 /* Setup the rndis query */
467 query = &request->request_msg.msg.query_req;
468 query->oid = oid;
469 query->info_buf_offset = sizeof(struct rndis_query_request);
470 query->info_buflen = 0;
471 query->dev_vc_handle = 0;
472
473 ret = rndis_filter_send_request(dev, request);
474 if (ret != 0)
475 goto cleanup;
476
477 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
478 if (t == 0) {
479 ret = -ETIMEDOUT;
480 goto cleanup;
481 }
482
483 /* Copy the response back */
484 query_complete = &request->response_msg.msg.query_complete;
485
486 if (query_complete->info_buflen > inresult_size) {
487 ret = -1;
488 goto cleanup;
489 }
490
491 memcpy(result,
492 (void *)((unsigned long)query_complete +
493 query_complete->info_buf_offset),
494 query_complete->info_buflen);
495
496 *result_size = query_complete->info_buflen;
497
498 cleanup:
499 if (request)
500 put_rndis_request(dev, request);
501
502 return ret;
503 }
504
rndis_filter_query_device_mac(struct rndis_device * dev)505 static int rndis_filter_query_device_mac(struct rndis_device *dev)
506 {
507 u32 size = ETH_ALEN;
508
509 return rndis_filter_query_device(dev,
510 RNDIS_OID_802_3_PERMANENT_ADDRESS,
511 dev->hw_mac_adr, &size);
512 }
513
rndis_filter_query_device_link_status(struct rndis_device * dev)514 static int rndis_filter_query_device_link_status(struct rndis_device *dev)
515 {
516 u32 size = sizeof(u32);
517 u32 link_status;
518 int ret;
519
520 ret = rndis_filter_query_device(dev,
521 RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
522 &link_status, &size);
523 dev->link_state = (link_status != 0) ? true : false;
524
525 return ret;
526 }
527
rndis_filter_set_packet_filter(struct rndis_device * dev,u32 new_filter)528 int rndis_filter_set_packet_filter(struct rndis_device *dev, u32 new_filter)
529 {
530 struct rndis_request *request;
531 struct rndis_set_request *set;
532 struct rndis_set_complete *set_complete;
533 u32 status;
534 int ret, t;
535 struct net_device *ndev;
536
537 ndev = dev->net_dev->ndev;
538
539 request = get_rndis_request(dev, REMOTE_NDIS_SET_MSG,
540 RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
541 sizeof(u32));
542 if (!request) {
543 ret = -ENOMEM;
544 goto cleanup;
545 }
546
547 /* Setup the rndis set */
548 set = &request->request_msg.msg.set_req;
549 set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
550 set->info_buflen = sizeof(u32);
551 set->info_buf_offset = sizeof(struct rndis_set_request);
552
553 memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
554 &new_filter, sizeof(u32));
555
556 ret = rndis_filter_send_request(dev, request);
557 if (ret != 0)
558 goto cleanup;
559
560 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
561
562 if (t == 0) {
563 netdev_err(ndev,
564 "timeout before we got a set response...\n");
565 /*
566 * We can't deallocate the request since we may still receive a
567 * send completion for it.
568 */
569 goto exit;
570 } else {
571 set_complete = &request->response_msg.msg.set_complete;
572 status = set_complete->status;
573 }
574
575 cleanup:
576 if (request)
577 put_rndis_request(dev, request);
578 exit:
579 return ret;
580 }
581
582
rndis_filter_init_device(struct rndis_device * dev)583 static int rndis_filter_init_device(struct rndis_device *dev)
584 {
585 struct rndis_request *request;
586 struct rndis_initialize_request *init;
587 struct rndis_initialize_complete *init_complete;
588 u32 status;
589 int ret, t;
590
591 request = get_rndis_request(dev, REMOTE_NDIS_INITIALIZE_MSG,
592 RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
593 if (!request) {
594 ret = -ENOMEM;
595 goto cleanup;
596 }
597
598 /* Setup the rndis set */
599 init = &request->request_msg.msg.init_req;
600 init->major_ver = RNDIS_MAJOR_VERSION;
601 init->minor_ver = RNDIS_MINOR_VERSION;
602 /* FIXME: Use 1536 - rounded ethernet frame size */
603 init->max_xfer_size = 2048;
604
605 dev->state = RNDIS_DEV_INITIALIZING;
606
607 ret = rndis_filter_send_request(dev, request);
608 if (ret != 0) {
609 dev->state = RNDIS_DEV_UNINITIALIZED;
610 goto cleanup;
611 }
612
613
614 t = wait_for_completion_timeout(&request->wait_event, 5*HZ);
615
616 if (t == 0) {
617 ret = -ETIMEDOUT;
618 goto cleanup;
619 }
620
621 init_complete = &request->response_msg.msg.init_complete;
622 status = init_complete->status;
623 if (status == RNDIS_STATUS_SUCCESS) {
624 dev->state = RNDIS_DEV_INITIALIZED;
625 ret = 0;
626 } else {
627 dev->state = RNDIS_DEV_UNINITIALIZED;
628 ret = -EINVAL;
629 }
630
631 cleanup:
632 if (request)
633 put_rndis_request(dev, request);
634
635 return ret;
636 }
637
rndis_filter_halt_device(struct rndis_device * dev)638 static void rndis_filter_halt_device(struct rndis_device *dev)
639 {
640 struct rndis_request *request;
641 struct rndis_halt_request *halt;
642
643 /* Attempt to do a rndis device halt */
644 request = get_rndis_request(dev, REMOTE_NDIS_HALT_MSG,
645 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
646 if (!request)
647 goto cleanup;
648
649 /* Setup the rndis set */
650 halt = &request->request_msg.msg.halt_req;
651 halt->req_id = atomic_inc_return(&dev->new_req_id);
652
653 /* Ignore return since this msg is optional. */
654 rndis_filter_send_request(dev, request);
655
656 dev->state = RNDIS_DEV_UNINITIALIZED;
657
658 cleanup:
659 if (request)
660 put_rndis_request(dev, request);
661 return;
662 }
663
rndis_filter_open_device(struct rndis_device * dev)664 static int rndis_filter_open_device(struct rndis_device *dev)
665 {
666 int ret;
667
668 if (dev->state != RNDIS_DEV_INITIALIZED)
669 return 0;
670
671 ret = rndis_filter_set_packet_filter(dev,
672 NDIS_PACKET_TYPE_BROADCAST |
673 NDIS_PACKET_TYPE_ALL_MULTICAST |
674 NDIS_PACKET_TYPE_DIRECTED);
675 if (ret == 0)
676 dev->state = RNDIS_DEV_DATAINITIALIZED;
677
678 return ret;
679 }
680
rndis_filter_close_device(struct rndis_device * dev)681 static int rndis_filter_close_device(struct rndis_device *dev)
682 {
683 int ret;
684
685 if (dev->state != RNDIS_DEV_DATAINITIALIZED)
686 return 0;
687
688 ret = rndis_filter_set_packet_filter(dev, 0);
689 if (ret == 0)
690 dev->state = RNDIS_DEV_INITIALIZED;
691
692 return ret;
693 }
694
rndis_filter_device_add(struct hv_device * dev,void * additional_info)695 int rndis_filter_device_add(struct hv_device *dev,
696 void *additional_info)
697 {
698 int ret;
699 struct netvsc_device *net_device;
700 struct rndis_device *rndis_device;
701 struct netvsc_device_info *device_info = additional_info;
702
703 rndis_device = get_rndis_device();
704 if (!rndis_device)
705 return -ENODEV;
706
707 /*
708 * Let the inner driver handle this first to create the netvsc channel
709 * NOTE! Once the channel is created, we may get a receive callback
710 * (RndisFilterOnReceive()) before this call is completed
711 */
712 ret = netvsc_device_add(dev, additional_info);
713 if (ret != 0) {
714 kfree(rndis_device);
715 return ret;
716 }
717
718
719 /* Initialize the rndis device */
720 net_device = hv_get_drvdata(dev);
721
722 net_device->extension = rndis_device;
723 rndis_device->net_dev = net_device;
724
725 /* Send the rndis initialization message */
726 ret = rndis_filter_init_device(rndis_device);
727 if (ret != 0) {
728 /*
729 * TODO: If rndis init failed, we will need to shut down the
730 * channel
731 */
732 }
733
734 /* Get the mac address */
735 ret = rndis_filter_query_device_mac(rndis_device);
736 if (ret != 0) {
737 /*
738 * TODO: shutdown rndis device and the channel
739 */
740 }
741
742 memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
743
744 rndis_filter_query_device_link_status(rndis_device);
745
746 device_info->link_state = rndis_device->link_state;
747
748 dev_info(&dev->device, "Device MAC %pM link state %s\n",
749 rndis_device->hw_mac_adr,
750 device_info->link_state ? "down" : "up");
751
752 return ret;
753 }
754
rndis_filter_device_remove(struct hv_device * dev)755 void rndis_filter_device_remove(struct hv_device *dev)
756 {
757 struct netvsc_device *net_dev = hv_get_drvdata(dev);
758 struct rndis_device *rndis_dev = net_dev->extension;
759
760 /* Halt and release the rndis device */
761 rndis_filter_halt_device(rndis_dev);
762
763 kfree(rndis_dev);
764 net_dev->extension = NULL;
765
766 netvsc_device_remove(dev);
767 }
768
769
rndis_filter_open(struct hv_device * dev)770 int rndis_filter_open(struct hv_device *dev)
771 {
772 struct netvsc_device *net_device = hv_get_drvdata(dev);
773
774 if (!net_device)
775 return -EINVAL;
776
777 return rndis_filter_open_device(net_device->extension);
778 }
779
rndis_filter_close(struct hv_device * dev)780 int rndis_filter_close(struct hv_device *dev)
781 {
782 struct netvsc_device *nvdev = hv_get_drvdata(dev);
783
784 if (!nvdev)
785 return -EINVAL;
786
787 return rndis_filter_close_device(nvdev->extension);
788 }
789
rndis_filter_send(struct hv_device * dev,struct hv_netvsc_packet * pkt)790 int rndis_filter_send(struct hv_device *dev,
791 struct hv_netvsc_packet *pkt)
792 {
793 int ret;
794 struct rndis_filter_packet *filter_pkt;
795 struct rndis_message *rndis_msg;
796 struct rndis_packet *rndis_pkt;
797 u32 rndis_msg_size;
798 bool isvlan = pkt->vlan_tci & VLAN_TAG_PRESENT;
799
800 /* Add the rndis header */
801 filter_pkt = (struct rndis_filter_packet *)pkt->extension;
802
803 rndis_msg = &filter_pkt->msg;
804 rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
805 if (isvlan)
806 rndis_msg_size += NDIS_VLAN_PPI_SIZE;
807
808 rndis_msg->ndis_msg_type = REMOTE_NDIS_PACKET_MSG;
809 rndis_msg->msg_len = pkt->total_data_buflen +
810 rndis_msg_size;
811
812 rndis_pkt = &rndis_msg->msg.pkt;
813 rndis_pkt->data_offset = sizeof(struct rndis_packet);
814 if (isvlan)
815 rndis_pkt->data_offset += NDIS_VLAN_PPI_SIZE;
816 rndis_pkt->data_len = pkt->total_data_buflen;
817
818 if (isvlan) {
819 struct rndis_per_packet_info *ppi;
820 struct ndis_pkt_8021q_info *vlan;
821
822 rndis_pkt->per_pkt_info_offset = sizeof(struct rndis_packet);
823 rndis_pkt->per_pkt_info_len = NDIS_VLAN_PPI_SIZE;
824
825 ppi = (struct rndis_per_packet_info *)((ulong)rndis_pkt +
826 rndis_pkt->per_pkt_info_offset);
827 ppi->size = NDIS_VLAN_PPI_SIZE;
828 ppi->type = IEEE_8021Q_INFO;
829 ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
830
831 vlan = (struct ndis_pkt_8021q_info *)((ulong)ppi +
832 ppi->ppi_offset);
833 vlan->vlanid = pkt->vlan_tci & VLAN_VID_MASK;
834 vlan->pri = (pkt->vlan_tci & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT;
835 }
836
837 pkt->is_data_pkt = true;
838 pkt->page_buf[0].pfn = virt_to_phys(rndis_msg) >> PAGE_SHIFT;
839 pkt->page_buf[0].offset =
840 (unsigned long)rndis_msg & (PAGE_SIZE-1);
841 pkt->page_buf[0].len = rndis_msg_size;
842
843 /* Add one page_buf if the rndis msg goes beyond page boundary */
844 if (pkt->page_buf[0].offset + rndis_msg_size > PAGE_SIZE) {
845 int i;
846 for (i = pkt->page_buf_cnt; i > 1; i--)
847 pkt->page_buf[i] = pkt->page_buf[i-1];
848 pkt->page_buf_cnt++;
849 pkt->page_buf[0].len = PAGE_SIZE - pkt->page_buf[0].offset;
850 pkt->page_buf[1].pfn = virt_to_phys((void *)((ulong)
851 rndis_msg + pkt->page_buf[0].len)) >> PAGE_SHIFT;
852 pkt->page_buf[1].offset = 0;
853 pkt->page_buf[1].len = rndis_msg_size - pkt->page_buf[0].len;
854 }
855
856 /* Save the packet send completion and context */
857 filter_pkt->completion = pkt->completion.send.send_completion;
858 filter_pkt->completion_ctx =
859 pkt->completion.send.send_completion_ctx;
860
861 /* Use ours */
862 pkt->completion.send.send_completion = rndis_filter_send_completion;
863 pkt->completion.send.send_completion_ctx = filter_pkt;
864
865 ret = netvsc_send(dev, pkt);
866 if (ret != 0) {
867 /*
868 * Reset the completion to originals to allow retries from
869 * above
870 */
871 pkt->completion.send.send_completion =
872 filter_pkt->completion;
873 pkt->completion.send.send_completion_ctx =
874 filter_pkt->completion_ctx;
875 }
876
877 return ret;
878 }
879
rndis_filter_send_completion(void * ctx)880 static void rndis_filter_send_completion(void *ctx)
881 {
882 struct rndis_filter_packet *filter_pkt = ctx;
883
884 /* Pass it back to the original handler */
885 filter_pkt->completion(filter_pkt->completion_ctx);
886 }
887
888
rndis_filter_send_request_completion(void * ctx)889 static void rndis_filter_send_request_completion(void *ctx)
890 {
891 /* Noop */
892 }
893