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staging: hv: Convert camel cased struct fields in netvsc_api.h to lower cases
[linux-2.6-block.git] / drivers / staging / hv / rndis_filter.c
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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/highmem.h>
23#include <linux/slab.h>
24#include <linux/io.h>
25#include <linux/if_ether.h>
26
27#include "osd.h"
28#include "logging.h"
29#include "netvsc_api.h"
30#include "rndis_filter.h"
31
32/* Data types */
33struct rndis_filter_driver_object {
34 /* The original driver */
35 struct netvsc_driver inner_drv;
36};
37
38enum rndis_device_state {
39 RNDIS_DEV_UNINITIALIZED = 0,
40 RNDIS_DEV_INITIALIZING,
41 RNDIS_DEV_INITIALIZED,
42 RNDIS_DEV_DATAINITIALIZED,
43};
44
45struct rndis_device {
46 struct netvsc_device *net_dev;
47
48 enum rndis_device_state state;
49 u32 link_stat;
50 atomic_t new_req_id;
51
52 spinlock_t request_lock;
53 struct list_head req_list;
54
55 unsigned char hw_mac_adr[ETH_ALEN];
56};
57
58struct rndis_request {
59 struct list_head list_ent;
60 struct osd_waitevent *waitevent;
61
62 /*
63 * FIXME: We assumed a fixed size response here. If we do ever need to
64 * handle a bigger response, we can either define a max response
65 * message or add a response buffer variable above this field
66 */
67 struct rndis_message response_msg;
68
69 /* Simplify allocation by having a netvsc packet inline */
70 struct hv_netvsc_packet pkt;
71 struct hv_page_buffer buf;
72 /* FIXME: We assumed a fixed size request here. */
73 struct rndis_message request_msg;
74};
75
76
77struct rndis_filter_packet {
78 void *completion_ctx;
79 void (*completion)(void *context);
80 struct rndis_message msg;
81};
82
83
84static int rndis_filte_device_add(struct hv_device *dev,
85 void *additional_info);
86
87static int rndis_filter_device_remove(struct hv_device *dev);
88
89static void rndis_filter_cleanup(struct hv_driver *drv);
90
91static int rndis_filter_send(struct hv_device *dev,
92 struct hv_netvsc_packet *pkt);
93
94static void rndis_filter_send_completion(void *ctx);
95
96static void rndis_filter_send_request_completion(void *ctx);
97
98
99/* The one and only */
100static struct rndis_filter_driver_object rndis_filter;
101
102static struct rndis_device *get_rndis_device(void)
103{
104 struct rndis_device *device;
105
106 device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
107 if (!device)
108 return NULL;
109
110 spin_lock_init(&device->request_lock);
111
112 INIT_LIST_HEAD(&device->req_list);
113
114 device->state = RNDIS_DEV_UNINITIALIZED;
115
116 return device;
117}
118
119static struct rndis_request *get_rndis_request(struct rndis_device *dev,
120 u32 msg_type,
121 u32 msg_len)
122{
123 struct rndis_request *request;
124 struct rndis_message *rndis_msg;
125 struct rndis_set_request *set;
126 unsigned long flags;
127
128 request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
129 if (!request)
130 return NULL;
131
132 request->waitevent = osd_waitevent_create();
133 if (!request->waitevent) {
134 kfree(request);
135 return NULL;
136 }
137
138 rndis_msg = &request->request_msg;
139 rndis_msg->NdisMessageType = msg_type;
140 rndis_msg->MessageLength = msg_len;
141
142 /*
143 * Set the request id. This field is always after the rndis header for
144 * request/response packet types so we just used the SetRequest as a
145 * template
146 */
147 set = &rndis_msg->Message.SetRequest;
148 set->RequestId = atomic_inc_return(&dev->new_req_id);
149
150 /* Add to the request list */
151 spin_lock_irqsave(&dev->request_lock, flags);
152 list_add_tail(&request->list_ent, &dev->req_list);
153 spin_unlock_irqrestore(&dev->request_lock, flags);
154
155 return request;
156}
157
158static void put_rndis_request(struct rndis_device *dev,
159 struct rndis_request *req)
160{
161 unsigned long flags;
162
163 spin_lock_irqsave(&dev->request_lock, flags);
164 list_del(&req->list_ent);
165 spin_unlock_irqrestore(&dev->request_lock, flags);
166
167 kfree(req->waitevent);
168 kfree(req);
169}
170
171static void dump_rndis_message(struct rndis_message *rndis_msg)
172{
173 switch (rndis_msg->NdisMessageType) {
174 case REMOTE_NDIS_PACKET_MSG:
175 DPRINT_DBG(NETVSC, "REMOTE_NDIS_PACKET_MSG (len %u, "
176 "data offset %u data len %u, # oob %u, "
177 "oob offset %u, oob len %u, pkt offset %u, "
178 "pkt len %u",
179 rndis_msg->MessageLength,
180 rndis_msg->Message.Packet.DataOffset,
181 rndis_msg->Message.Packet.DataLength,
182 rndis_msg->Message.Packet.NumOOBDataElements,
183 rndis_msg->Message.Packet.OOBDataOffset,
184 rndis_msg->Message.Packet.OOBDataLength,
185 rndis_msg->Message.Packet.PerPacketInfoOffset,
186 rndis_msg->Message.Packet.PerPacketInfoLength);
187 break;
188
189 case REMOTE_NDIS_INITIALIZE_CMPLT:
190 DPRINT_DBG(NETVSC, "REMOTE_NDIS_INITIALIZE_CMPLT "
191 "(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
192 "device flags %d, max xfer size 0x%x, max pkts %u, "
193 "pkt aligned %u)",
194 rndis_msg->MessageLength,
195 rndis_msg->Message.InitializeComplete.RequestId,
196 rndis_msg->Message.InitializeComplete.Status,
197 rndis_msg->Message.InitializeComplete.MajorVersion,
198 rndis_msg->Message.InitializeComplete.MinorVersion,
199 rndis_msg->Message.InitializeComplete.DeviceFlags,
200 rndis_msg->Message.InitializeComplete.MaxTransferSize,
201 rndis_msg->Message.InitializeComplete.
202 MaxPacketsPerMessage,
203 rndis_msg->Message.InitializeComplete.
204 PacketAlignmentFactor);
205 break;
206
207 case REMOTE_NDIS_QUERY_CMPLT:
208 DPRINT_DBG(NETVSC, "REMOTE_NDIS_QUERY_CMPLT "
209 "(len %u, id 0x%x, status 0x%x, buf len %u, "
210 "buf offset %u)",
211 rndis_msg->MessageLength,
212 rndis_msg->Message.QueryComplete.RequestId,
213 rndis_msg->Message.QueryComplete.Status,
214 rndis_msg->Message.QueryComplete.
215 InformationBufferLength,
216 rndis_msg->Message.QueryComplete.
217 InformationBufferOffset);
218 break;
219
220 case REMOTE_NDIS_SET_CMPLT:
221 DPRINT_DBG(NETVSC,
222 "REMOTE_NDIS_SET_CMPLT (len %u, id 0x%x, status 0x%x)",
223 rndis_msg->MessageLength,
224 rndis_msg->Message.SetComplete.RequestId,
225 rndis_msg->Message.SetComplete.Status);
226 break;
227
228 case REMOTE_NDIS_INDICATE_STATUS_MSG:
229 DPRINT_DBG(NETVSC, "REMOTE_NDIS_INDICATE_STATUS_MSG "
230 "(len %u, status 0x%x, buf len %u, buf offset %u)",
231 rndis_msg->MessageLength,
232 rndis_msg->Message.IndicateStatus.Status,
233 rndis_msg->Message.IndicateStatus.StatusBufferLength,
234 rndis_msg->Message.IndicateStatus.StatusBufferOffset);
235 break;
236
237 default:
238 DPRINT_DBG(NETVSC, "0x%x (len %u)",
239 rndis_msg->NdisMessageType,
240 rndis_msg->MessageLength);
241 break;
242 }
243}
244
245static int rndis_filter_send_request(struct rndis_device *dev,
246 struct rndis_request *req)
247{
248 int ret;
249 struct hv_netvsc_packet *packet;
250
251 /* Setup the packet to send it */
252 packet = &req->pkt;
253
254 packet->is_data_pkt = false;
255 packet->total_data_buflen = req->request_msg.MessageLength;
256 packet->page_buf_cnt = 1;
257
258 packet->page_buf[0].Pfn = virt_to_phys(&req->request_msg) >>
259 PAGE_SHIFT;
260 packet->page_buf[0].Length = req->request_msg.MessageLength;
261 packet->page_buf[0].Offset =
262 (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
263
264 packet->completion.send.send_completion_ctx = req;/* packet; */
265 packet->completion.send.send_completion =
266 rndis_filter_send_request_completion;
267 packet->completion.send.send_completion_tid = (unsigned long)dev;
268
269 ret = rndis_filter.inner_drv.send(dev->net_dev->Device, packet);
270 return ret;
271}
272
273static void rndis_filter_receive_response(struct rndis_device *dev,
274 struct rndis_message *resp)
275{
276 struct rndis_request *request = NULL;
277 bool found = false;
278 unsigned long flags;
279
280 spin_lock_irqsave(&dev->request_lock, flags);
281 list_for_each_entry(request, &dev->req_list, list_ent) {
282 /*
283 * All request/response message contains RequestId as the 1st
284 * field
285 */
286 if (request->request_msg.Message.InitializeRequest.RequestId
287 == resp->Message.InitializeComplete.RequestId) {
288 DPRINT_DBG(NETVSC, "found rndis request for "
289 "this response (id 0x%x req type 0x%x res "
290 "type 0x%x)",
291 request->request_msg.Message.
292 InitializeRequest.RequestId,
293 request->request_msg.NdisMessageType,
294 resp->NdisMessageType);
295
296 found = true;
297 break;
298 }
299 }
300 spin_unlock_irqrestore(&dev->request_lock, flags);
301
302 if (found) {
303 if (resp->MessageLength <= sizeof(struct rndis_message)) {
304 memcpy(&request->response_msg, resp,
305 resp->MessageLength);
306 } else {
307 DPRINT_ERR(NETVSC, "rndis response buffer overflow "
308 "detected (size %u max %zu)",
309 resp->MessageLength,
310 sizeof(struct rndis_filter_packet));
311
312 if (resp->NdisMessageType ==
313 REMOTE_NDIS_RESET_CMPLT) {
314 /* does not have a request id field */
315 request->response_msg.Message.ResetComplete.
316 Status = STATUS_BUFFER_OVERFLOW;
317 } else {
318 request->response_msg.Message.
319 InitializeComplete.Status =
320 STATUS_BUFFER_OVERFLOW;
321 }
322 }
323
324 osd_waitevent_set(request->waitevent);
325 } else {
326 DPRINT_ERR(NETVSC, "no rndis request found for this response "
327 "(id 0x%x res type 0x%x)",
328 resp->Message.InitializeComplete.RequestId,
329 resp->NdisMessageType);
330 }
331}
332
333static void rndis_filter_receive_indicate_status(struct rndis_device *dev,
334 struct rndis_message *resp)
335{
336 struct rndis_indicate_status *indicate =
337 &resp->Message.IndicateStatus;
338
339 if (indicate->Status == RNDIS_STATUS_MEDIA_CONNECT) {
340 rndis_filter.inner_drv.link_status_change(
341 dev->net_dev->Device, 1);
342 } else if (indicate->Status == RNDIS_STATUS_MEDIA_DISCONNECT) {
343 rndis_filter.inner_drv.link_status_change(
344 dev->net_dev->Device, 0);
345 } else {
346 /*
347 * TODO:
348 */
349 }
350}
351
352static void rndis_filter_receive_data(struct rndis_device *dev,
353 struct rndis_message *msg,
354 struct hv_netvsc_packet *pkt)
355{
356 struct rndis_packet *rndis_pkt;
357 u32 data_offset;
358
359 /* empty ethernet frame ?? */
360 /* ASSERT(Packet->PageBuffers[0].Length > */
361 /* RNDIS_MESSAGE_SIZE(struct rndis_packet)); */
362
363 rndis_pkt = &msg->Message.Packet;
364
365 /*
366 * FIXME: Handle multiple rndis pkt msgs that maybe enclosed in this
367 * netvsc packet (ie TotalDataBufferLength != MessageLength)
368 */
369
370 /* Remove the rndis header and pass it back up the stack */
371 data_offset = RNDIS_HEADER_SIZE + rndis_pkt->DataOffset;
372
373 pkt->total_data_buflen -= data_offset;
374 pkt->page_buf[0].Offset += data_offset;
375 pkt->page_buf[0].Length -= data_offset;
376
377 pkt->is_data_pkt = true;
378
379 rndis_filter.inner_drv.recv_cb(dev->net_dev->Device,
380 pkt);
381}
382
383static int rndis_filter_receive(struct hv_device *dev,
384 struct hv_netvsc_packet *pkt)
385{
386 struct netvsc_device *net_dev = dev->Extension;
387 struct rndis_device *rndis_dev;
388 struct rndis_message rndis_msg;
389 struct rndis_message *rndis_hdr;
390
391 if (!net_dev)
392 return -EINVAL;
393
394 /* Make sure the rndis device state is initialized */
395 if (!net_dev->Extension) {
396 DPRINT_ERR(NETVSC, "got rndis message but no rndis device..."
397 "dropping this message!");
398 return -1;
399 }
400
401 rndis_dev = (struct rndis_device *)net_dev->Extension;
402 if (rndis_dev->state == RNDIS_DEV_UNINITIALIZED) {
403 DPRINT_ERR(NETVSC, "got rndis message but rndis device "
404 "uninitialized...dropping this message!");
405 return -1;
406 }
407
408 rndis_hdr = (struct rndis_message *)kmap_atomic(
409 pfn_to_page(pkt->page_buf[0].Pfn), KM_IRQ0);
410
411 rndis_hdr = (void *)((unsigned long)rndis_hdr +
412 pkt->page_buf[0].Offset);
413
414 /* Make sure we got a valid rndis message */
415 /*
416 * FIXME: There seems to be a bug in set completion msg where its
417 * MessageLength is 16 bytes but the ByteCount field in the xfer page
418 * range shows 52 bytes
419 * */
420#if 0
421 if (pkt->total_data_buflen != rndis_hdr->MessageLength) {
422 kunmap_atomic(rndis_hdr - pkt->page_buf[0].Offset,
423 KM_IRQ0);
424
425 DPRINT_ERR(NETVSC, "invalid rndis message? (expected %u "
426 "bytes got %u)...dropping this message!",
427 rndis_hdr->MessageLength,
428 pkt->total_data_buflen);
429 return -1;
430 }
431#endif
432
433 if ((rndis_hdr->NdisMessageType != REMOTE_NDIS_PACKET_MSG) &&
434 (rndis_hdr->MessageLength > sizeof(struct rndis_message))) {
435 DPRINT_ERR(NETVSC, "incoming rndis message buffer overflow "
436 "detected (got %u, max %zu)...marking it an error!",
437 rndis_hdr->MessageLength,
438 sizeof(struct rndis_message));
439 }
440
441 memcpy(&rndis_msg, rndis_hdr,
442 (rndis_hdr->MessageLength > sizeof(struct rndis_message)) ?
443 sizeof(struct rndis_message) :
444 rndis_hdr->MessageLength);
445
446 kunmap_atomic(rndis_hdr - pkt->page_buf[0].Offset, KM_IRQ0);
447
448 dump_rndis_message(&rndis_msg);
449
450 switch (rndis_msg.NdisMessageType) {
451 case REMOTE_NDIS_PACKET_MSG:
452 /* data msg */
453 rndis_filter_receive_data(rndis_dev, &rndis_msg, pkt);
454 break;
455
456 case REMOTE_NDIS_INITIALIZE_CMPLT:
457 case REMOTE_NDIS_QUERY_CMPLT:
458 case REMOTE_NDIS_SET_CMPLT:
459 /* case REMOTE_NDIS_RESET_CMPLT: */
460 /* case REMOTE_NDIS_KEEPALIVE_CMPLT: */
461 /* completion msgs */
462 rndis_filter_receive_response(rndis_dev, &rndis_msg);
463 break;
464
465 case REMOTE_NDIS_INDICATE_STATUS_MSG:
466 /* notification msgs */
467 rndis_filter_receive_indicate_status(rndis_dev, &rndis_msg);
468 break;
469 default:
470 DPRINT_ERR(NETVSC, "unhandled rndis message (type %u len %u)",
471 rndis_msg.NdisMessageType,
472 rndis_msg.MessageLength);
473 break;
474 }
475
476 return 0;
477}
478
479static int rndis_filter_query_device(struct rndis_device *dev, u32 oid,
480 void *result, u32 *result_size)
481{
482 struct rndis_request *request;
483 u32 inresult_size = *result_size;
484 struct rndis_query_request *query;
485 struct rndis_query_complete *query_complete;
486 int ret = 0;
487
488 if (!result)
489 return -EINVAL;
490
491 *result_size = 0;
492 request = get_rndis_request(dev, REMOTE_NDIS_QUERY_MSG,
493 RNDIS_MESSAGE_SIZE(struct rndis_query_request));
494 if (!request) {
495 ret = -1;
496 goto Cleanup;
497 }
498
499 /* Setup the rndis query */
500 query = &request->request_msg.Message.QueryRequest;
501 query->Oid = oid;
502 query->InformationBufferOffset = sizeof(struct rndis_query_request);
503 query->InformationBufferLength = 0;
504 query->DeviceVcHandle = 0;
505
506 ret = rndis_filter_send_request(dev, request);
507 if (ret != 0)
508 goto Cleanup;
509
510 osd_waitevent_wait(request->waitevent);
511
512 /* Copy the response back */
513 query_complete = &request->response_msg.Message.QueryComplete;
514
515 if (query_complete->InformationBufferLength > inresult_size) {
516 ret = -1;
517 goto Cleanup;
518 }
519
520 memcpy(result,
521 (void *)((unsigned long)query_complete +
522 query_complete->InformationBufferOffset),
523 query_complete->InformationBufferLength);
524
525 *result_size = query_complete->InformationBufferLength;
526
527Cleanup:
528 if (request)
529 put_rndis_request(dev, request);
530
531 return ret;
532}
533
534static int rndis_filter_query_device_mac(struct rndis_device *dev)
535{
536 u32 size = ETH_ALEN;
537
538 return rndis_filter_query_device(dev,
539 RNDIS_OID_802_3_PERMANENT_ADDRESS,
540 dev->hw_mac_adr, &size);
541}
542
543static int rndis_filter_query_device_link_status(struct rndis_device *dev)
544{
545 u32 size = sizeof(u32);
546
547 return rndis_filter_query_device(dev,
548 RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
549 &dev->link_stat, &size);
550}
551
552static int rndis_filter_set_packet_filter(struct rndis_device *dev,
553 u32 new_filter)
554{
555 struct rndis_request *request;
556 struct rndis_set_request *set;
557 struct rndis_set_complete *set_complete;
558 u32 status;
559 int ret;
560
561 /* ASSERT(RNDIS_MESSAGE_SIZE(struct rndis_set_request) + sizeof(u32) <= */
562 /* sizeof(struct rndis_message)); */
563
564 request = get_rndis_request(dev, REMOTE_NDIS_SET_MSG,
565 RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
566 sizeof(u32));
567 if (!request) {
568 ret = -1;
569 goto Cleanup;
570 }
571
572 /* Setup the rndis set */
573 set = &request->request_msg.Message.SetRequest;
574 set->Oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
575 set->InformationBufferLength = sizeof(u32);
576 set->InformationBufferOffset = sizeof(struct rndis_set_request);
577
578 memcpy((void *)(unsigned long)set + sizeof(struct rndis_set_request),
579 &new_filter, sizeof(u32));
580
581 ret = rndis_filter_send_request(dev, request);
582 if (ret != 0)
583 goto Cleanup;
584
585 ret = osd_waitevent_waitex(request->waitevent, 2000/*2sec*/);
586 if (!ret) {
587 ret = -1;
588 DPRINT_ERR(NETVSC, "timeout before we got a set response...");
589 /*
590 * We cant deallocate the request since we may still receive a
591 * send completion for it.
592 */
593 goto Exit;
594 } else {
595 if (ret > 0)
596 ret = 0;
597 set_complete = &request->response_msg.Message.SetComplete;
598 status = set_complete->Status;
599 }
600
601Cleanup:
602 if (request)
603 put_rndis_request(dev, request);
604Exit:
605 return ret;
606}
607
608int rndis_filter_init(struct netvsc_driver *drv)
609{
610 DPRINT_DBG(NETVSC, "sizeof(struct rndis_filter_packet) == %zd",
611 sizeof(struct rndis_filter_packet));
612
613 drv->req_ext_size = sizeof(struct rndis_filter_packet);
614
615 /* Driver->Context = rndisDriver; */
616
617 memset(&rndis_filter, 0, sizeof(struct rndis_filter_driver_object));
618
619 /*rndisDriver->Driver = Driver;
620
621 ASSERT(Driver->OnLinkStatusChanged);
622 rndisDriver->OnLinkStatusChanged = Driver->OnLinkStatusChanged;*/
623
624 /* Save the original dispatch handlers before we override it */
625 rndis_filter.inner_drv.base.OnDeviceAdd = drv->base.OnDeviceAdd;
626 rndis_filter.inner_drv.base.OnDeviceRemove =
627 drv->base.OnDeviceRemove;
628 rndis_filter.inner_drv.base.OnCleanup = drv->base.OnCleanup;
629
630 /* ASSERT(Driver->OnSend); */
631 /* ASSERT(Driver->OnReceiveCallback); */
632 rndis_filter.inner_drv.send = drv->send;
633 rndis_filter.inner_drv.recv_cb = drv->recv_cb;
634 rndis_filter.inner_drv.link_status_change =
635 drv->link_status_change;
636
637 /* Override */
638 drv->base.OnDeviceAdd = rndis_filte_device_add;
639 drv->base.OnDeviceRemove = rndis_filter_device_remove;
640 drv->base.OnCleanup = rndis_filter_cleanup;
641 drv->send = rndis_filter_send;
642 /* Driver->QueryLinkStatus = RndisFilterQueryDeviceLinkStatus; */
643 drv->recv_cb = rndis_filter_receive;
644
645 return 0;
646}
647
648static int rndis_filter_init_device(struct rndis_device *dev)
649{
650 struct rndis_request *request;
651 struct rndis_initialize_request *init;
652 struct rndis_initialize_complete *init_complete;
653 u32 status;
654 int ret;
655
656 request = get_rndis_request(dev, REMOTE_NDIS_INITIALIZE_MSG,
657 RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
658 if (!request) {
659 ret = -1;
660 goto Cleanup;
661 }
662
663 /* Setup the rndis set */
664 init = &request->request_msg.Message.InitializeRequest;
665 init->MajorVersion = RNDIS_MAJOR_VERSION;
666 init->MinorVersion = RNDIS_MINOR_VERSION;
667 /* FIXME: Use 1536 - rounded ethernet frame size */
668 init->MaxTransferSize = 2048;
669
670 dev->state = RNDIS_DEV_INITIALIZING;
671
672 ret = rndis_filter_send_request(dev, request);
673 if (ret != 0) {
674 dev->state = RNDIS_DEV_UNINITIALIZED;
675 goto Cleanup;
676 }
677
678 osd_waitevent_wait(request->waitevent);
679
680 init_complete = &request->response_msg.Message.InitializeComplete;
681 status = init_complete->Status;
682 if (status == RNDIS_STATUS_SUCCESS) {
683 dev->state = RNDIS_DEV_INITIALIZED;
684 ret = 0;
685 } else {
686 dev->state = RNDIS_DEV_UNINITIALIZED;
687 ret = -1;
688 }
689
690Cleanup:
691 if (request)
692 put_rndis_request(dev, request);
693
694 return ret;
695}
696
697static void rndis_filter_halt_device(struct rndis_device *dev)
698{
699 struct rndis_request *request;
700 struct rndis_halt_request *halt;
701
702 /* Attempt to do a rndis device halt */
703 request = get_rndis_request(dev, REMOTE_NDIS_HALT_MSG,
704 RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
705 if (!request)
706 goto Cleanup;
707
708 /* Setup the rndis set */
709 halt = &request->request_msg.Message.HaltRequest;
710 halt->RequestId = atomic_inc_return(&dev->new_req_id);
711
712 /* Ignore return since this msg is optional. */
713 rndis_filter_send_request(dev, request);
714
715 dev->state = RNDIS_DEV_UNINITIALIZED;
716
717Cleanup:
718 if (request)
719 put_rndis_request(dev, request);
720 return;
721}
722
723static int rndis_filter_open_device(struct rndis_device *dev)
724{
725 int ret;
726
727 if (dev->state != RNDIS_DEV_INITIALIZED)
728 return 0;
729
730 ret = rndis_filter_set_packet_filter(dev,
731 NDIS_PACKET_TYPE_BROADCAST |
732 NDIS_PACKET_TYPE_ALL_MULTICAST |
733 NDIS_PACKET_TYPE_DIRECTED);
734 if (ret == 0)
735 dev->state = RNDIS_DEV_DATAINITIALIZED;
736
737 return ret;
738}
739
740static int rndis_filter_close_device(struct rndis_device *dev)
741{
742 int ret;
743
744 if (dev->state != RNDIS_DEV_DATAINITIALIZED)
745 return 0;
746
747 ret = rndis_filter_set_packet_filter(dev, 0);
748 if (ret == 0)
749 dev->state = RNDIS_DEV_INITIALIZED;
750
751 return ret;
752}
753
754static int rndis_filte_device_add(struct hv_device *dev,
755 void *additional_info)
756{
757 int ret;
758 struct netvsc_device *netDevice;
759 struct rndis_device *rndisDevice;
760 struct netvsc_device_info *deviceInfo = additional_info;
761
762 rndisDevice = get_rndis_device();
763 if (!rndisDevice)
764 return -1;
765
766 DPRINT_DBG(NETVSC, "rndis device object allocated - %p", rndisDevice);
767
768 /*
769 * Let the inner driver handle this first to create the netvsc channel
770 * NOTE! Once the channel is created, we may get a receive callback
771 * (RndisFilterOnReceive()) before this call is completed
772 */
773 ret = rndis_filter.inner_drv.base.OnDeviceAdd(dev, additional_info);
774 if (ret != 0) {
775 kfree(rndisDevice);
776 return ret;
777 }
778
779
780 /* Initialize the rndis device */
781 netDevice = dev->Extension;
782 /* ASSERT(netDevice); */
783 /* ASSERT(netDevice->Device); */
784
785 netDevice->Extension = rndisDevice;
786 rndisDevice->net_dev = netDevice;
787
788 /* Send the rndis initialization message */
789 ret = rndis_filter_init_device(rndisDevice);
790 if (ret != 0) {
791 /*
792 * TODO: If rndis init failed, we will need to shut down the
793 * channel
794 */
795 }
796
797 /* Get the mac address */
798 ret = rndis_filter_query_device_mac(rndisDevice);
799 if (ret != 0) {
800 /*
801 * TODO: shutdown rndis device and the channel
802 */
803 }
804
805 DPRINT_INFO(NETVSC, "Device 0x%p mac addr %pM",
806 rndisDevice, rndisDevice->hw_mac_adr);
807
808 memcpy(deviceInfo->mac_adr, rndisDevice->hw_mac_adr, ETH_ALEN);
809
810 rndis_filter_query_device_link_status(rndisDevice);
811
812 deviceInfo->link_state = rndisDevice->link_stat;
813 DPRINT_INFO(NETVSC, "Device 0x%p link state %s", rndisDevice,
814 ((deviceInfo->link_state) ? ("down") : ("up")));
815
816 return ret;
817}
818
819static int rndis_filter_device_remove(struct hv_device *dev)
820{
821 struct netvsc_device *net_dev = dev->Extension;
822 struct rndis_device *rndis_dev = net_dev->Extension;
823
824 /* Halt and release the rndis device */
825 rndis_filter_halt_device(rndis_dev);
826
827 kfree(rndis_dev);
828 net_dev->Extension = NULL;
829
830 /* Pass control to inner driver to remove the device */
831 rndis_filter.inner_drv.base.OnDeviceRemove(dev);
832
833 return 0;
834}
835
836static void rndis_filter_cleanup(struct hv_driver *drv)
837{
838}
839
840int rndis_filter_open(struct hv_device *dev)
841{
842 struct netvsc_device *netDevice = dev->Extension;
843
844 if (!netDevice)
845 return -EINVAL;
846
847 return rndis_filter_open_device(netDevice->Extension);
848}
849
850int rndis_filter_close(struct hv_device *dev)
851{
852 struct netvsc_device *netDevice = dev->Extension;
853
854 if (!netDevice)
855 return -EINVAL;
856
857 return rndis_filter_close_device(netDevice->Extension);
858}
859
860static int rndis_filter_send(struct hv_device *dev,
861 struct hv_netvsc_packet *pkt)
862{
863 int ret;
864 struct rndis_filter_packet *filterPacket;
865 struct rndis_message *rndisMessage;
866 struct rndis_packet *rndisPacket;
867 u32 rndisMessageSize;
868
869 /* Add the rndis header */
870 filterPacket = (struct rndis_filter_packet *)pkt->extension;
871 /* ASSERT(filterPacket); */
872
873 memset(filterPacket, 0, sizeof(struct rndis_filter_packet));
874
875 rndisMessage = &filterPacket->msg;
876 rndisMessageSize = RNDIS_MESSAGE_SIZE(struct rndis_packet);
877
878 rndisMessage->NdisMessageType = REMOTE_NDIS_PACKET_MSG;
879 rndisMessage->MessageLength = pkt->total_data_buflen +
880 rndisMessageSize;
881
882 rndisPacket = &rndisMessage->Message.Packet;
883 rndisPacket->DataOffset = sizeof(struct rndis_packet);
884 rndisPacket->DataLength = pkt->total_data_buflen;
885
886 pkt->is_data_pkt = true;
887 pkt->page_buf[0].Pfn = virt_to_phys(rndisMessage) >> PAGE_SHIFT;
888 pkt->page_buf[0].Offset =
889 (unsigned long)rndisMessage & (PAGE_SIZE-1);
890 pkt->page_buf[0].Length = rndisMessageSize;
891
892 /* Save the packet send completion and context */
893 filterPacket->completion = pkt->completion.send.send_completion;
894 filterPacket->completion_ctx =
895 pkt->completion.send.send_completion_ctx;
896
897 /* Use ours */
898 pkt->completion.send.send_completion = rndis_filter_send_completion;
899 pkt->completion.send.send_completion_ctx = filterPacket;
900
901 ret = rndis_filter.inner_drv.send(dev, pkt);
902 if (ret != 0) {
903 /*
904 * Reset the completion to originals to allow retries from
905 * above
906 */
907 pkt->completion.send.send_completion =
908 filterPacket->completion;
909 pkt->completion.send.send_completion_ctx =
910 filterPacket->completion_ctx;
911 }
912
913 return ret;
914}
915
916static void rndis_filter_send_completion(void *ctx)
917{
918 struct rndis_filter_packet *filterPacket = ctx;
919
920 /* Pass it back to the original handler */
921 filterPacket->completion(filterPacket->completion_ctx);
922}
923
924
925static void rndis_filter_send_request_completion(void *ctx)
926{
927 /* Noop */
928}
Linux 6.x block layer and io_uring tree(s)