1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* Copyright (c) 2009, Microsoft Corporation.
4	*
5	* Authors:
6	* Haiyang Zhang <haiyangz@microsoft.com>
7	* Hank Janssen <hjanssen@microsoft.com>
8	*/
9	#include <linux/ethtool.h>
10	#include <linux/kernel.h>
11	#include <linux/sched.h>
12	#include <linux/wait.h>
13	#include <linux/highmem.h>
14	#include <linux/slab.h>
15	#include <linux/io.h>
16	#include <linux/if_ether.h>
17	#include <linux/netdevice.h>
18	#include <linux/if_vlan.h>
19	#include <linux/nls.h>
20	#include <linux/vmalloc.h>
21	#include <linux/rtnetlink.h>
22	#include <linux/ucs2_string.h>
23	#include <linux/string.h>
24
25	#include "hyperv_net.h"
26	#include "netvsc_trace.h"
27
28	static void rndis_set_multicast(struct work_struct *w);
29
30	#define RNDIS_EXT_LEN HV_HYP_PAGE_SIZE
31	struct rndis_request {
32	struct list_head list_ent;
33	struct completion wait_event;
34
35	struct rndis_message response_msg;
36	/*
37	* The buffer for extended info after the RNDIS response message. It's
38	* referenced based on the data offset in the RNDIS message. Its size
39	* is enough for current needs, and should be sufficient for the near
40	* future.
41	*/
42	u8 response_ext[RNDIS_EXT_LEN];
43
44	/* Simplify allocation by having a netvsc packet inline */
45	struct hv_netvsc_packet pkt;
46
47	struct rndis_message request_msg;
48	/*
49	* The buffer for the extended info after the RNDIS request message.
50	* It is referenced and sized in a similar way as response_ext.
51	*/
52	u8 request_ext[RNDIS_EXT_LEN];
53	};
54
55	static const u8 netvsc_hash_key[NETVSC_HASH_KEYLEN] = {
56	0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2,
57	0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0,
58	0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4,
59	0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c,
60	0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa
61	};
62
63	static struct rndis_device *get_rndis_device(void)
64	{
65	struct rndis_device *device;
66
67	device = kzalloc(sizeof(struct rndis_device), GFP_KERNEL);
68	if (!device)
69	return NULL;
70
71	spin_lock_init(&device->request_lock);
72
73	INIT_LIST_HEAD(list: &device->req_list);
74	INIT_WORK(&device->mcast_work, rndis_set_multicast);
75
76	device->state = RNDIS_DEV_UNINITIALIZED;
77
78	return device;
79	}
80
81	static struct rndis_request *get_rndis_request(struct rndis_device *dev,
82	u32 msg_type,
83	u32 msg_len)
84	{
85	struct rndis_request *request;
86	struct rndis_message *rndis_msg;
87	struct rndis_set_request *set;
88	unsigned long flags;
89
90	request = kzalloc(sizeof(struct rndis_request), GFP_KERNEL);
91	if (!request)
92	return NULL;
93
94	init_completion(x: &request->wait_event);
95
96	rndis_msg = &request->request_msg;
97	rndis_msg->ndis_msg_type = msg_type;
98	rndis_msg->msg_len = msg_len;
99
100	request->pkt.q_idx = 0;
101
102	/*
103	* Set the request id. This field is always after the rndis header for
104	* request/response packet types so we just used the SetRequest as a
105	* template
106	*/
107	set = &rndis_msg->msg.set_req;
108	set->req_id = atomic_inc_return(v: &dev->new_req_id);
109
110	/* Add to the request list */
111	spin_lock_irqsave(&dev->request_lock, flags);
112	list_add_tail(new: &request->list_ent, head: &dev->req_list);
113	spin_unlock_irqrestore(lock: &dev->request_lock, flags);
114
115	return request;
116	}
117
118	static void put_rndis_request(struct rndis_device *dev,
119	struct rndis_request *req)
120	{
121	unsigned long flags;
122
123	spin_lock_irqsave(&dev->request_lock, flags);
124	list_del(entry: &req->list_ent);
125	spin_unlock_irqrestore(lock: &dev->request_lock, flags);
126
127	kfree(objp: req);
128	}
129
130	static void dump_rndis_message(struct net_device *netdev,
131	const struct rndis_message *rndis_msg,
132	const void *data)
133	{
134	switch (rndis_msg->ndis_msg_type) {
135	case RNDIS_MSG_PACKET:
136	if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >= sizeof(struct rndis_packet)) {
137	const struct rndis_packet *pkt = data + RNDIS_HEADER_SIZE;
138	netdev_dbg(netdev, "RNDIS_MSG_PACKET (len %u, "
139	"data offset %u data len %u, # oob %u, "
140	"oob offset %u, oob len %u, pkt offset %u, "
141	"pkt len %u\n",
142	rndis_msg->msg_len,
143	pkt->data_offset,
144	pkt->data_len,
145	pkt->num_oob_data_elements,
146	pkt->oob_data_offset,
147	pkt->oob_data_len,
148	pkt->per_pkt_info_offset,
149	pkt->per_pkt_info_len);
150	}
151	break;
152
153	case RNDIS_MSG_INIT_C:
154	if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >=
155	sizeof(struct rndis_initialize_complete)) {
156	const struct rndis_initialize_complete *init_complete =
157	data + RNDIS_HEADER_SIZE;
158	netdev_dbg(netdev, "RNDIS_MSG_INIT_C "
159	"(len %u, id 0x%x, status 0x%x, major %d, minor %d, "
160	"device flags %d, max xfer size 0x%x, max pkts %u, "
161	"pkt aligned %u)\n",
162	rndis_msg->msg_len,
163	init_complete->req_id,
164	init_complete->status,
165	init_complete->major_ver,
166	init_complete->minor_ver,
167	init_complete->dev_flags,
168	init_complete->max_xfer_size,
169	init_complete->max_pkt_per_msg,
170	init_complete->pkt_alignment_factor);
171	}
172	break;
173
174	case RNDIS_MSG_QUERY_C:
175	if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >=
176	sizeof(struct rndis_query_complete)) {
177	const struct rndis_query_complete *query_complete =
178	data + RNDIS_HEADER_SIZE;
179	netdev_dbg(netdev, "RNDIS_MSG_QUERY_C "
180	"(len %u, id 0x%x, status 0x%x, buf len %u, "
181	"buf offset %u)\n",
182	rndis_msg->msg_len,
183	query_complete->req_id,
184	query_complete->status,
185	query_complete->info_buflen,
186	query_complete->info_buf_offset);
187	}
188	break;
189
190	case RNDIS_MSG_SET_C:
191	if (rndis_msg->msg_len - RNDIS_HEADER_SIZE + sizeof(struct rndis_set_complete)) {
192	const struct rndis_set_complete *set_complete =
193	data + RNDIS_HEADER_SIZE;
194	netdev_dbg(netdev,
195	"RNDIS_MSG_SET_C (len %u, id 0x%x, status 0x%x)\n",
196	rndis_msg->msg_len,
197	set_complete->req_id,
198	set_complete->status);
199	}
200	break;
201
202	case RNDIS_MSG_INDICATE:
203	if (rndis_msg->msg_len - RNDIS_HEADER_SIZE >=
204	sizeof(struct rndis_indicate_status)) {
205	const struct rndis_indicate_status *indicate_status =
206	data + RNDIS_HEADER_SIZE;
207	netdev_dbg(netdev, "RNDIS_MSG_INDICATE "
208	"(len %u, status 0x%x, buf len %u, buf offset %u)\n",
209	rndis_msg->msg_len,
210	indicate_status->status,
211	indicate_status->status_buflen,
212	indicate_status->status_buf_offset);
213	}
214	break;
215
216	default:
217	netdev_dbg(netdev, "0x%x (len %u)\n",
218	rndis_msg->ndis_msg_type,
219	rndis_msg->msg_len);
220	break;
221	}
222	}
223
224	static int rndis_filter_send_request(struct rndis_device *dev,
225	struct rndis_request *req)
226	{
227	struct hv_netvsc_packet *packet;
228	struct hv_page_buffer pb;
229	int ret;
230
231	/* Setup the packet to send it */
232	packet = &req->pkt;
233
234	packet->total_data_buflen = req->request_msg.msg_len;
235	packet->page_buf_cnt = 1;
236
237	pb.pfn = virt_to_phys(address: &req->request_msg) >> HV_HYP_PAGE_SHIFT;
238	pb.len = req->request_msg.msg_len;
239	pb.offset = offset_in_hvpage(&req->request_msg);
240
241	trace_rndis_send(ndev: dev->ndev, q: 0, msg: &req->request_msg);
242
243	rcu_read_lock_bh();
244	ret = netvsc_send(net: dev->ndev, packet, NULL, page_buffer: &pb, NULL, xdp_tx: false);
245	rcu_read_unlock_bh();
246
247	return ret;
248	}
249
250	static void rndis_set_link_state(struct rndis_device *rdev,
251	struct rndis_request *request)
252	{
253	u32 link_status;
254	struct rndis_query_complete *query_complete;
255	u32 msg_len = request->response_msg.msg_len;
256
257	/* Ensure the packet is big enough to access its fields */
258	if (msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_query_complete))
259	return;
260
261	query_complete = &request->response_msg.msg.query_complete;
262
263	if (query_complete->status == RNDIS_STATUS_SUCCESS &&
264	query_complete->info_buflen >= sizeof(u32) &&
265	query_complete->info_buf_offset >= sizeof(*query_complete) &&
266	msg_len - RNDIS_HEADER_SIZE >= query_complete->info_buf_offset &&
267	msg_len - RNDIS_HEADER_SIZE - query_complete->info_buf_offset
268	>= query_complete->info_buflen) {
269	memcpy(&link_status, (void *)((unsigned long)query_complete +
270	query_complete->info_buf_offset), sizeof(u32));
271	rdev->link_state = link_status != 0;
272	}
273	}
274
275	static void rndis_filter_receive_response(struct net_device *ndev,
276	struct netvsc_device *nvdev,
277	struct rndis_message *resp,
278	void *data)
279	{
280	u32 *req_id = &resp->msg.init_complete.req_id;
281	struct rndis_device *dev = nvdev->extension;
282	struct rndis_request *request = NULL;
283	bool found = false;
284	unsigned long flags;
285
286	/* This should never happen, it means control message
287	* response received after device removed.
288	*/
289	if (dev->state == RNDIS_DEV_UNINITIALIZED) {
290	netdev_err(dev: ndev,
291	format: "got rndis message uninitialized\n");
292	return;
293	}
294
295	/* Ensure the packet is big enough to read req_id. Req_id is the 1st
296	* field in any request/response message, so the payload should have at
297	* least sizeof(u32) bytes
298	*/
299	if (resp->msg_len - RNDIS_HEADER_SIZE < sizeof(u32)) {
300	netdev_err(dev: ndev, format: "rndis msg_len too small: %u\n",
301	resp->msg_len);
302	return;
303	}
304
305	/* Copy the request ID into nvchan->recv_buf */
306	*req_id = *(u32 *)(data + RNDIS_HEADER_SIZE);
307
308	spin_lock_irqsave(&dev->request_lock, flags);
309	list_for_each_entry(request, &dev->req_list, list_ent) {
310	/*
311	* All request/response message contains RequestId as the 1st
312	* field
313	*/
314	if (request->request_msg.msg.init_req.req_id == *req_id) {
315	found = true;
316	break;
317	}
318	}
319	spin_unlock_irqrestore(lock: &dev->request_lock, flags);
320
321	if (found) {
322	if (resp->msg_len <=
323	sizeof(struct rndis_message) + RNDIS_EXT_LEN) {
324	memcpy(&request->response_msg, resp, RNDIS_HEADER_SIZE + sizeof(*req_id));
325	unsafe_memcpy((void *)&request->response_msg + RNDIS_HEADER_SIZE + sizeof(*req_id),
326	data + RNDIS_HEADER_SIZE + sizeof(*req_id),
327	resp->msg_len - RNDIS_HEADER_SIZE - sizeof(*req_id),
328	"request->response_msg is followed by a padding of RNDIS_EXT_LEN inside rndis_request");
329	if (request->request_msg.ndis_msg_type ==
330	RNDIS_MSG_QUERY && request->request_msg.msg.
331	query_req.oid == RNDIS_OID_GEN_MEDIA_CONNECT_STATUS)
332	rndis_set_link_state(rdev: dev, request);
333	} else {
334	netdev_err(dev: ndev,
335	format: "rndis response buffer overflow "
336	"detected (size %u max %zu)\n",
337	resp->msg_len,
338	sizeof(struct rndis_message));
339
340	if (resp->ndis_msg_type ==
341	RNDIS_MSG_RESET_C) {
342	/* does not have a request id field */
343	request->response_msg.msg.reset_complete.
344	status = RNDIS_STATUS_BUFFER_OVERFLOW;
345	} else {
346	request->response_msg.msg.
347	init_complete.status =
348	RNDIS_STATUS_BUFFER_OVERFLOW;
349	}
350	}
351
352	netvsc_dma_unmap(hv_dev: ((struct net_device_context *)
353	netdev_priv(dev: ndev))->device_ctx, packet: &request->pkt);
354	complete(&request->wait_event);
355	} else {
356	netdev_err(dev: ndev,
357	format: "no rndis request found for this response "
358	"(id 0x%x res type 0x%x)\n",
359	*req_id,
360	resp->ndis_msg_type);
361	}
362	}
363
364	/*
365	* Get the Per-Packet-Info with the specified type
366	* return NULL if not found.
367	*/
368	static inline void *rndis_get_ppi(struct net_device *ndev,
369	struct rndis_packet *rpkt,
370	u32 rpkt_len, u32 type, u8 internal,
371	u32 ppi_size, void *data)
372	{
373	struct rndis_per_packet_info *ppi;
374	int len;
375
376	if (rpkt->per_pkt_info_offset == 0)
377	return NULL;
378
379	/* Validate info_offset and info_len */
380	if (rpkt->per_pkt_info_offset < sizeof(struct rndis_packet) ||
381	rpkt->per_pkt_info_offset > rpkt_len) {
382	netdev_err(dev: ndev, format: "Invalid per_pkt_info_offset: %u\n",
383	rpkt->per_pkt_info_offset);
384	return NULL;
385	}
386
387	if (rpkt->per_pkt_info_len < sizeof(*ppi) ||
388	rpkt->per_pkt_info_len > rpkt_len - rpkt->per_pkt_info_offset) {
389	netdev_err(dev: ndev, format: "Invalid per_pkt_info_len: %u\n",
390	rpkt->per_pkt_info_len);
391	return NULL;
392	}
393
394	ppi = (struct rndis_per_packet_info *)((ulong)rpkt +
395	rpkt->per_pkt_info_offset);
396	/* Copy the PPIs into nvchan->recv_buf */
397	memcpy(ppi, data + RNDIS_HEADER_SIZE + rpkt->per_pkt_info_offset, rpkt->per_pkt_info_len);
398	len = rpkt->per_pkt_info_len;
399
400	while (len > 0) {
401	/* Validate ppi_offset and ppi_size */
402	if (ppi->size > len) {
403	netdev_err(dev: ndev, format: "Invalid ppi size: %u\n", ppi->size);
404	continue;
405	}
406
407	if (ppi->ppi_offset >= ppi->size) {
408	netdev_err(dev: ndev, format: "Invalid ppi_offset: %u\n", ppi->ppi_offset);
409	continue;
410	}
411
412	if (ppi->type == type && ppi->internal == internal) {
413	/* ppi->size should be big enough to hold the returned object. */
414	if (ppi->size - ppi->ppi_offset < ppi_size) {
415	netdev_err(dev: ndev, format: "Invalid ppi: size %u ppi_offset %u\n",
416	ppi->size, ppi->ppi_offset);
417	continue;
418	}
419	return (void *)((ulong)ppi + ppi->ppi_offset);
420	}
421	len -= ppi->size;
422	ppi = (struct rndis_per_packet_info *)((ulong)ppi + ppi->size);
423	}
424
425	return NULL;
426	}
427
428	static inline
429	void rsc_add_data(struct netvsc_channel *nvchan,
430	const struct ndis_pkt_8021q_info *vlan,
431	const struct ndis_tcp_ip_checksum_info *csum_info,
432	const u32 *hash_info,
433	void *data, u32 len)
434	{
435	u32 cnt = nvchan->rsc.cnt;
436
437	if (cnt) {
438	nvchan->rsc.pktlen += len;
439	} else {
440	/* The data/values pointed by vlan, csum_info and hash_info are shared
441	* across the different 'fragments' of the RSC packet; store them into
442	* the packet itself.
443	*/
444	if (vlan != NULL) {
445	memcpy(&nvchan->rsc.vlan, vlan, sizeof(*vlan));
446	nvchan->rsc.ppi_flags |= NVSC_RSC_VLAN;
447	} else {
448	nvchan->rsc.ppi_flags &= ~NVSC_RSC_VLAN;
449	}
450	if (csum_info != NULL) {
451	memcpy(&nvchan->rsc.csum_info, csum_info, sizeof(*csum_info));
452	nvchan->rsc.ppi_flags |= NVSC_RSC_CSUM_INFO;
453	} else {
454	nvchan->rsc.ppi_flags &= ~NVSC_RSC_CSUM_INFO;
455	}
456	nvchan->rsc.pktlen = len;
457	if (hash_info != NULL) {
458	nvchan->rsc.hash_info = *hash_info;
459	nvchan->rsc.ppi_flags |= NVSC_RSC_HASH_INFO;
460	} else {
461	nvchan->rsc.ppi_flags &= ~NVSC_RSC_HASH_INFO;
462	}
463	}
464
465	nvchan->rsc.data[cnt] = data;
466	nvchan->rsc.len[cnt] = len;
467	nvchan->rsc.cnt++;
468	}
469
470	static int rndis_filter_receive_data(struct net_device *ndev,
471	struct netvsc_device *nvdev,
472	struct netvsc_channel *nvchan,
473	struct rndis_message *msg,
474	void *data, u32 data_buflen)
475	{
476	struct rndis_packet *rndis_pkt = &msg->msg.pkt;
477	const struct ndis_tcp_ip_checksum_info *csum_info;
478	const struct ndis_pkt_8021q_info *vlan;
479	const struct rndis_pktinfo_id *pktinfo_id;
480	const u32 *hash_info;
481	u32 data_offset, rpkt_len;
482	bool rsc_more = false;
483	int ret;
484
485	/* Ensure data_buflen is big enough to read header fields */
486	if (data_buflen < RNDIS_HEADER_SIZE + sizeof(struct rndis_packet)) {
487	netdev_err(dev: ndev, format: "invalid rndis pkt, data_buflen too small: %u\n",
488	data_buflen);
489	return NVSP_STAT_FAIL;
490	}
491
492	/* Copy the RNDIS packet into nvchan->recv_buf */
493	memcpy(rndis_pkt, data + RNDIS_HEADER_SIZE, sizeof(*rndis_pkt));
494
495	/* Validate rndis_pkt offset */
496	if (rndis_pkt->data_offset >= data_buflen - RNDIS_HEADER_SIZE) {
497	netdev_err(dev: ndev, format: "invalid rndis packet offset: %u\n",
498	rndis_pkt->data_offset);
499	return NVSP_STAT_FAIL;
500	}
501
502	/* Remove the rndis header and pass it back up the stack */
503	data_offset = RNDIS_HEADER_SIZE + rndis_pkt->data_offset;
504
505	rpkt_len = data_buflen - RNDIS_HEADER_SIZE;
506	data_buflen -= data_offset;
507
508	/*
509	* Make sure we got a valid RNDIS message, now total_data_buflen
510	* should be the data packet size plus the trailer padding size
511	*/
512	if (unlikely(data_buflen < rndis_pkt->data_len)) {
513	netdev_err(dev: ndev, format: "rndis message buffer "
514	"overflow detected (got %u, min %u)"
515	"...dropping this message!\n",
516	data_buflen, rndis_pkt->data_len);
517	return NVSP_STAT_FAIL;
518	}
519
520	vlan = rndis_get_ppi(ndev, rpkt: rndis_pkt, rpkt_len, type: IEEE_8021Q_INFO, internal: 0, ppi_size: sizeof(*vlan),
521	data);
522
523	csum_info = rndis_get_ppi(ndev, rpkt: rndis_pkt, rpkt_len, type: TCPIP_CHKSUM_PKTINFO, internal: 0,
524	ppi_size: sizeof(*csum_info), data);
525
526	hash_info = rndis_get_ppi(ndev, rpkt: rndis_pkt, rpkt_len, type: NBL_HASH_VALUE, internal: 0,
527	ppi_size: sizeof(*hash_info), data);
528
529	pktinfo_id = rndis_get_ppi(ndev, rpkt: rndis_pkt, rpkt_len, type: RNDIS_PKTINFO_ID, internal: 1,
530	ppi_size: sizeof(*pktinfo_id), data);
531
532	/* Identify RSC frags, drop erroneous packets */
533	if (pktinfo_id && (pktinfo_id->flag & RNDIS_PKTINFO_SUBALLOC)) {
534	if (pktinfo_id->flag & RNDIS_PKTINFO_1ST_FRAG)
535	nvchan->rsc.cnt = 0;
536	else if (nvchan->rsc.cnt == 0)
537	goto drop;
538
539	rsc_more = true;
540
541	if (pktinfo_id->flag & RNDIS_PKTINFO_LAST_FRAG)
542	rsc_more = false;
543
544	if (rsc_more && nvchan->rsc.is_last)
545	goto drop;
546	} else {
547	nvchan->rsc.cnt = 0;
548	}
549
550	if (unlikely(nvchan->rsc.cnt >= NVSP_RSC_MAX))
551	goto drop;
552
553	/* Put data into per channel structure.
554	* Also, remove the rndis trailer padding from rndis packet message
555	* rndis_pkt->data_len tell us the real data length, we only copy
556	* the data packet to the stack, without the rndis trailer padding
557	*/
558	rsc_add_data(nvchan, vlan, csum_info, hash_info,
559	data: data + data_offset, len: rndis_pkt->data_len);
560
561	if (rsc_more)
562	return NVSP_STAT_SUCCESS;
563
564	ret = netvsc_recv_callback(net: ndev, nvdev, nvchan);
565	nvchan->rsc.cnt = 0;
566
567	return ret;
568
569	drop:
570	return NVSP_STAT_FAIL;
571	}
572
573	int rndis_filter_receive(struct net_device *ndev,
574	struct netvsc_device *net_dev,
575	struct netvsc_channel *nvchan,
576	void *data, u32 buflen)
577	{
578	struct net_device_context *net_device_ctx = netdev_priv(dev: ndev);
579	struct rndis_message *rndis_msg = nvchan->recv_buf;
580
581	if (buflen < RNDIS_HEADER_SIZE) {
582	netdev_err(dev: ndev, format: "Invalid rndis_msg (buflen: %u)\n", buflen);
583	return NVSP_STAT_FAIL;
584	}
585
586	/* Copy the RNDIS msg header into nvchan->recv_buf */
587	memcpy(rndis_msg, data, RNDIS_HEADER_SIZE);
588
589	/* Validate incoming rndis_message packet */
590	if (rndis_msg->msg_len < RNDIS_HEADER_SIZE ||
591	buflen < rndis_msg->msg_len) {
592	netdev_err(dev: ndev, format: "Invalid rndis_msg (buflen: %u, msg_len: %u)\n",
593	buflen, rndis_msg->msg_len);
594	return NVSP_STAT_FAIL;
595	}
596
597	if (netif_msg_rx_status(net_device_ctx))
598	dump_rndis_message(netdev: ndev, rndis_msg, data);
599
600	switch (rndis_msg->ndis_msg_type) {
601	case RNDIS_MSG_PACKET:
602	return rndis_filter_receive_data(ndev, nvdev: net_dev, nvchan,
603	msg: rndis_msg, data, data_buflen: buflen);
604	case RNDIS_MSG_INIT_C:
605	case RNDIS_MSG_QUERY_C:
606	case RNDIS_MSG_SET_C:
607	/* completion msgs */
608	rndis_filter_receive_response(ndev, nvdev: net_dev, resp: rndis_msg, data);
609	break;
610
611	case RNDIS_MSG_INDICATE:
612	/* notification msgs */
613	netvsc_linkstatus_callback(net: ndev, resp: rndis_msg, data, data_buflen: buflen);
614	break;
615	default:
616	netdev_err(dev: ndev,
617	format: "unhandled rndis message (type %u len %u)\n",
618	rndis_msg->ndis_msg_type,
619	rndis_msg->msg_len);
620	return NVSP_STAT_FAIL;
621	}
622
623	return NVSP_STAT_SUCCESS;
624	}
625
626	static int rndis_filter_query_device(struct rndis_device *dev,
627	struct netvsc_device *nvdev,
628	u32 oid, void *result, u32 *result_size)
629	{
630	struct rndis_request *request;
631	u32 inresult_size = *result_size;
632	struct rndis_query_request *query;
633	struct rndis_query_complete *query_complete;
634	u32 msg_len;
635	int ret = 0;
636
637	if (!result)
638	return -EINVAL;
639
640	*result_size = 0;
641	request = get_rndis_request(dev, RNDIS_MSG_QUERY,
642	RNDIS_MESSAGE_SIZE(struct rndis_query_request));
643	if (!request) {
644	ret = -ENOMEM;
645	goto cleanup;
646	}
647
648	/* Setup the rndis query */
649	query = &request->request_msg.msg.query_req;
650	query->oid = oid;
651	query->info_buf_offset = sizeof(struct rndis_query_request);
652	query->info_buflen = 0;
653	query->dev_vc_handle = 0;
654
655	if (oid == OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES) {
656	struct ndis_offload *hwcaps;
657	u32 nvsp_version = nvdev->nvsp_version;
658	u8 ndis_rev;
659	size_t size;
660
661	if (nvsp_version >= NVSP_PROTOCOL_VERSION_5) {
662	ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
663	size = NDIS_OFFLOAD_SIZE;
664	} else if (nvsp_version >= NVSP_PROTOCOL_VERSION_4) {
665	ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_2;
666	size = NDIS_OFFLOAD_SIZE_6_1;
667	} else {
668	ndis_rev = NDIS_OFFLOAD_PARAMETERS_REVISION_1;
669	size = NDIS_OFFLOAD_SIZE_6_0;
670	}
671
672	request->request_msg.msg_len += size;
673	query->info_buflen = size;
674	hwcaps = (struct ndis_offload *)
675	((unsigned long)query + query->info_buf_offset);
676
677	hwcaps->header.type = NDIS_OBJECT_TYPE_OFFLOAD;
678	hwcaps->header.revision = ndis_rev;
679	hwcaps->header.size = size;
680
681	} else if (oid == OID_GEN_RECEIVE_SCALE_CAPABILITIES) {
682	struct ndis_recv_scale_cap *cap;
683
684	request->request_msg.msg_len +=
685	sizeof(struct ndis_recv_scale_cap);
686	query->info_buflen = sizeof(struct ndis_recv_scale_cap);
687	cap = (struct ndis_recv_scale_cap *)((unsigned long)query +
688	query->info_buf_offset);
689	cap->hdr.type = NDIS_OBJECT_TYPE_RSS_CAPABILITIES;
690	cap->hdr.rev = NDIS_RECEIVE_SCALE_CAPABILITIES_REVISION_2;
691	cap->hdr.size = sizeof(struct ndis_recv_scale_cap);
692	}
693
694	ret = rndis_filter_send_request(dev, req: request);
695	if (ret != 0)
696	goto cleanup;
697
698	wait_for_completion(&request->wait_event);
699
700	/* Copy the response back */
701	query_complete = &request->response_msg.msg.query_complete;
702	msg_len = request->response_msg.msg_len;
703
704	/* Ensure the packet is big enough to access its fields */
705	if (msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_query_complete)) {
706	ret = -1;
707	goto cleanup;
708	}
709
710	if (query_complete->info_buflen > inresult_size ||
711	query_complete->info_buf_offset < sizeof(*query_complete) ||
712	msg_len - RNDIS_HEADER_SIZE < query_complete->info_buf_offset ||
713	msg_len - RNDIS_HEADER_SIZE - query_complete->info_buf_offset
714	< query_complete->info_buflen) {
715	ret = -1;
716	goto cleanup;
717	}
718
719	memcpy(result,
720	(void *)((unsigned long)query_complete +
721	query_complete->info_buf_offset),
722	query_complete->info_buflen);
723
724	*result_size = query_complete->info_buflen;
725
726	cleanup:
727	if (request)
728	put_rndis_request(dev, req: request);
729
730	return ret;
731	}
732
733	/* Get the hardware offload capabilities */
734	static int
735	rndis_query_hwcaps(struct rndis_device *dev, struct netvsc_device *net_device,
736	struct ndis_offload *caps)
737	{
738	u32 caps_len = sizeof(*caps);
739	int ret;
740
741	memset(caps, 0, sizeof(*caps));
742
743	ret = rndis_filter_query_device(dev, nvdev: net_device,
744	OID_TCP_OFFLOAD_HARDWARE_CAPABILITIES,
745	result: caps, result_size: &caps_len);
746	if (ret)
747	return ret;
748
749	if (caps->header.type != NDIS_OBJECT_TYPE_OFFLOAD) {
750	netdev_warn(dev: dev->ndev, format: "invalid NDIS objtype %#x\n",
751	caps->header.type);
752	return -EINVAL;
753	}
754
755	if (caps->header.revision < NDIS_OFFLOAD_PARAMETERS_REVISION_1) {
756	netdev_warn(dev: dev->ndev, format: "invalid NDIS objrev %x\n",
757	caps->header.revision);
758	return -EINVAL;
759	}
760
761	if (caps->header.size > caps_len ||
762	caps->header.size < NDIS_OFFLOAD_SIZE_6_0) {
763	netdev_warn(dev: dev->ndev,
764	format: "invalid NDIS objsize %u, data size %u\n",
765	caps->header.size, caps_len);
766	return -EINVAL;
767	}
768
769	return 0;
770	}
771
772	static int rndis_filter_query_device_mac(struct rndis_device *dev,
773	struct netvsc_device *net_device)
774	{
775	u32 size = ETH_ALEN;
776
777	return rndis_filter_query_device(dev, nvdev: net_device,
778	RNDIS_OID_802_3_PERMANENT_ADDRESS,
779	result: dev->hw_mac_adr, result_size: &size);
780	}
781
782	#define NWADR_STR "NetworkAddress"
783	#define NWADR_STRLEN 14
784
785	int rndis_filter_set_device_mac(struct netvsc_device *nvdev,
786	const char *mac)
787	{
788	struct rndis_device *rdev = nvdev->extension;
789	struct rndis_request *request;
790	struct rndis_set_request *set;
791	struct rndis_config_parameter_info *cpi;
792	wchar_t *cfg_nwadr, *cfg_mac;
793	struct rndis_set_complete *set_complete;
794	char macstr[2*ETH_ALEN+1];
795	u32 extlen = sizeof(struct rndis_config_parameter_info) +
796	2*NWADR_STRLEN + 4*ETH_ALEN;
797	int ret;
798
799	request = get_rndis_request(dev: rdev, RNDIS_MSG_SET,
800	RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
801	if (!request)
802	return -ENOMEM;
803
804	set = &request->request_msg.msg.set_req;
805	set->oid = RNDIS_OID_GEN_RNDIS_CONFIG_PARAMETER;
806	set->info_buflen = extlen;
807	set->info_buf_offset = sizeof(struct rndis_set_request);
808	set->dev_vc_handle = 0;
809
810	cpi = (struct rndis_config_parameter_info *)((ulong)set +
811	set->info_buf_offset);
812	cpi->parameter_name_offset =
813	sizeof(struct rndis_config_parameter_info);
814	/* Multiply by 2 because host needs 2 bytes (utf16) for each char */
815	cpi->parameter_name_length = 2*NWADR_STRLEN;
816	cpi->parameter_type = RNDIS_CONFIG_PARAM_TYPE_STRING;
817	cpi->parameter_value_offset =
818	cpi->parameter_name_offset + cpi->parameter_name_length;
819	/* Multiply by 4 because each MAC byte displayed as 2 utf16 chars */
820	cpi->parameter_value_length = 4*ETH_ALEN;
821
822	cfg_nwadr = (wchar_t *)((ulong)cpi + cpi->parameter_name_offset);
823	cfg_mac = (wchar_t *)((ulong)cpi + cpi->parameter_value_offset);
824	ret = utf8s_to_utf16s(NWADR_STR, NWADR_STRLEN, endian: UTF16_HOST_ENDIAN,
825	pwcs: cfg_nwadr, NWADR_STRLEN);
826	if (ret < 0)
827	goto cleanup;
828	snprintf(buf: macstr, size: 2*ETH_ALEN+1, fmt: "%pm", mac);
829	ret = utf8s_to_utf16s(s: macstr, len: 2*ETH_ALEN, endian: UTF16_HOST_ENDIAN,
830	pwcs: cfg_mac, maxlen: 2*ETH_ALEN);
831	if (ret < 0)
832	goto cleanup;
833
834	ret = rndis_filter_send_request(dev: rdev, req: request);
835	if (ret != 0)
836	goto cleanup;
837
838	wait_for_completion(&request->wait_event);
839
840	set_complete = &request->response_msg.msg.set_complete;
841	if (set_complete->status != RNDIS_STATUS_SUCCESS)
842	ret = -EIO;
843
844	cleanup:
845	put_rndis_request(dev: rdev, req: request);
846	return ret;
847	}
848
849	int
850	rndis_filter_set_offload_params(struct net_device *ndev,
851	struct netvsc_device *nvdev,
852	struct ndis_offload_params *req_offloads)
853	{
854	struct rndis_device *rdev = nvdev->extension;
855	struct rndis_request *request;
856	struct rndis_set_request *set;
857	struct ndis_offload_params *offload_params;
858	struct rndis_set_complete *set_complete;
859	u32 extlen = sizeof(struct ndis_offload_params);
860	int ret;
861	u32 vsp_version = nvdev->nvsp_version;
862
863	if (vsp_version <= NVSP_PROTOCOL_VERSION_4) {
864	extlen = VERSION_4_OFFLOAD_SIZE;
865	/* On NVSP_PROTOCOL_VERSION_4 and below, we do not support
866	* UDP checksum offload.
867	*/
868	req_offloads->udp_ip_v4_csum = 0;
869	req_offloads->udp_ip_v6_csum = 0;
870	}
871
872	request = get_rndis_request(dev: rdev, RNDIS_MSG_SET,
873	RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
874	if (!request)
875	return -ENOMEM;
876
877	set = &request->request_msg.msg.set_req;
878	set->oid = OID_TCP_OFFLOAD_PARAMETERS;
879	set->info_buflen = extlen;
880	set->info_buf_offset = sizeof(struct rndis_set_request);
881	set->dev_vc_handle = 0;
882
883	offload_params = (struct ndis_offload_params *)((ulong)set +
884	set->info_buf_offset);
885	*offload_params = *req_offloads;
886	offload_params->header.type = NDIS_OBJECT_TYPE_DEFAULT;
887	offload_params->header.revision = NDIS_OFFLOAD_PARAMETERS_REVISION_3;
888	offload_params->header.size = extlen;
889
890	ret = rndis_filter_send_request(dev: rdev, req: request);
891	if (ret != 0)
892	goto cleanup;
893
894	wait_for_completion(&request->wait_event);
895	set_complete = &request->response_msg.msg.set_complete;
896	if (set_complete->status != RNDIS_STATUS_SUCCESS) {
897	netdev_err(dev: ndev, format: "Fail to set offload on host side:0x%x\n",
898	set_complete->status);
899	ret = -EINVAL;
900	}
901
902	cleanup:
903	put_rndis_request(dev: rdev, req: request);
904	return ret;
905	}
906
907	static int rndis_set_rss_param_msg(struct rndis_device *rdev,
908	const u8 *rss_key, u16 flag)
909	{
910	struct net_device *ndev = rdev->ndev;
911	struct net_device_context *ndc = netdev_priv(dev: ndev);
912	struct rndis_request *request;
913	struct rndis_set_request *set;
914	struct rndis_set_complete *set_complete;
915	u32 extlen = sizeof(struct ndis_recv_scale_param) +
916	4 * ndc->rx_table_sz + NETVSC_HASH_KEYLEN;
917	struct ndis_recv_scale_param *rssp;
918	u32 *itab;
919	u8 *keyp;
920	int i, ret;
921
922	request = get_rndis_request(
923	dev: rdev, RNDIS_MSG_SET,
924	RNDIS_MESSAGE_SIZE(struct rndis_set_request) + extlen);
925	if (!request)
926	return -ENOMEM;
927
928	set = &request->request_msg.msg.set_req;
929	set->oid = OID_GEN_RECEIVE_SCALE_PARAMETERS;
930	set->info_buflen = extlen;
931	set->info_buf_offset = sizeof(struct rndis_set_request);
932	set->dev_vc_handle = 0;
933
934	rssp = (struct ndis_recv_scale_param *)(set + 1);
935	rssp->hdr.type = NDIS_OBJECT_TYPE_RSS_PARAMETERS;
936	rssp->hdr.rev = NDIS_RECEIVE_SCALE_PARAMETERS_REVISION_2;
937	rssp->hdr.size = sizeof(struct ndis_recv_scale_param);
938	rssp->flag = flag;
939	rssp->hashinfo = NDIS_HASH_FUNC_TOEPLITZ | NDIS_HASH_IPV4 |
940	NDIS_HASH_TCP_IPV4 | NDIS_HASH_IPV6 |
941	NDIS_HASH_TCP_IPV6;
942	rssp->indirect_tabsize = 4 * ndc->rx_table_sz;
943	rssp->indirect_taboffset = sizeof(struct ndis_recv_scale_param);
944	rssp->hashkey_size = NETVSC_HASH_KEYLEN;
945	rssp->hashkey_offset = rssp->indirect_taboffset +
946	rssp->indirect_tabsize;
947
948	/* Set indirection table entries */
949	itab = (u32 *)(rssp + 1);
950	for (i = 0; i < ndc->rx_table_sz; i++)
951	itab[i] = ndc->rx_table[i];
952
953	/* Set hask key values */
954	keyp = (u8 *)((unsigned long)rssp + rssp->hashkey_offset);
955	memcpy(keyp, rss_key, NETVSC_HASH_KEYLEN);
956
957	ret = rndis_filter_send_request(dev: rdev, req: request);
958	if (ret != 0)
959	goto cleanup;
960
961	wait_for_completion(&request->wait_event);
962	set_complete = &request->response_msg.msg.set_complete;
963	if (set_complete->status == RNDIS_STATUS_SUCCESS) {
964	if (!(flag & NDIS_RSS_PARAM_FLAG_DISABLE_RSS) &&
965	!(flag & NDIS_RSS_PARAM_FLAG_HASH_KEY_UNCHANGED))
966	memcpy(rdev->rss_key, rss_key, NETVSC_HASH_KEYLEN);
967
968	} else {
969	netdev_err(dev: ndev, format: "Fail to set RSS parameters:0x%x\n",
970	set_complete->status);
971	ret = -EINVAL;
972	}
973
974	cleanup:
975	put_rndis_request(dev: rdev, req: request);
976	return ret;
977	}
978
979	int rndis_filter_set_rss_param(struct rndis_device *rdev,
980	const u8 *rss_key)
981	{
982	/* Disable RSS before change */
983	rndis_set_rss_param_msg(rdev, rss_key,
984	NDIS_RSS_PARAM_FLAG_DISABLE_RSS);
985
986	return rndis_set_rss_param_msg(rdev, rss_key, flag: 0);
987	}
988
989	static int rndis_filter_query_device_link_status(struct rndis_device *dev,
990	struct netvsc_device *net_device)
991	{
992	u32 size = sizeof(u32);
993	u32 link_status;
994
995	return rndis_filter_query_device(dev, nvdev: net_device,
996	RNDIS_OID_GEN_MEDIA_CONNECT_STATUS,
997	result: &link_status, result_size: &size);
998	}
999
1000	static int rndis_filter_query_link_speed(struct rndis_device *dev,
1001	struct netvsc_device *net_device)
1002	{
1003	u32 size = sizeof(u32);
1004	u32 link_speed;
1005	struct net_device_context *ndc;
1006	int ret;
1007
1008	ret = rndis_filter_query_device(dev, nvdev: net_device,
1009	RNDIS_OID_GEN_LINK_SPEED,
1010	result: &link_speed, result_size: &size);
1011
1012	if (!ret) {
1013	ndc = netdev_priv(dev: dev->ndev);
1014
1015	/* The link speed reported from host is in 100bps unit, so
1016	* we convert it to Mbps here.
1017	*/
1018	ndc->speed = link_speed / 10000;
1019	}
1020
1021	return ret;
1022	}
1023
1024	static int rndis_filter_set_packet_filter(struct rndis_device *dev,
1025	u32 new_filter)
1026	{
1027	struct rndis_request *request;
1028	struct rndis_set_request *set;
1029	int ret;
1030
1031	if (dev->filter == new_filter)
1032	return 0;
1033
1034	request = get_rndis_request(dev, RNDIS_MSG_SET,
1035	RNDIS_MESSAGE_SIZE(struct rndis_set_request) +
1036	sizeof(u32));
1037	if (!request)
1038	return -ENOMEM;
1039
1040	/* Setup the rndis set */
1041	set = &request->request_msg.msg.set_req;
1042	set->oid = RNDIS_OID_GEN_CURRENT_PACKET_FILTER;
1043	set->info_buflen = sizeof(u32);
1044	set->info_buf_offset = offsetof(typeof(*set), info_buf);
1045	memcpy(set->info_buf, &new_filter, sizeof(u32));
1046
1047	ret = rndis_filter_send_request(dev, req: request);
1048	if (ret == 0) {
1049	wait_for_completion(&request->wait_event);
1050	dev->filter = new_filter;
1051	}
1052
1053	put_rndis_request(dev, req: request);
1054
1055	return ret;
1056	}
1057
1058	static void rndis_set_multicast(struct work_struct *w)
1059	{
1060	struct rndis_device *rdev
1061	= container_of(w, struct rndis_device, mcast_work);
1062	u32 filter = NDIS_PACKET_TYPE_DIRECTED;
1063	unsigned int flags = rdev->ndev->flags;
1064
1065	if (flags & IFF_PROMISC) {
1066	filter = NDIS_PACKET_TYPE_PROMISCUOUS;
1067	} else {
1068	if (!netdev_mc_empty(rdev->ndev) || (flags & IFF_ALLMULTI))
1069	filter |= NDIS_PACKET_TYPE_ALL_MULTICAST;
1070	if (flags & IFF_BROADCAST)
1071	filter |= NDIS_PACKET_TYPE_BROADCAST;
1072	}
1073
1074	rndis_filter_set_packet_filter(dev: rdev, new_filter: filter);
1075	}
1076
1077	void rndis_filter_update(struct netvsc_device *nvdev)
1078	{
1079	struct rndis_device *rdev = nvdev->extension;
1080
1081	schedule_work(work: &rdev->mcast_work);
1082	}
1083
1084	static int rndis_filter_init_device(struct rndis_device *dev,
1085	struct netvsc_device *nvdev)
1086	{
1087	struct rndis_request *request;
1088	struct rndis_initialize_request *init;
1089	struct rndis_initialize_complete *init_complete;
1090	u32 status;
1091	int ret;
1092
1093	request = get_rndis_request(dev, RNDIS_MSG_INIT,
1094	RNDIS_MESSAGE_SIZE(struct rndis_initialize_request));
1095	if (!request) {
1096	ret = -ENOMEM;
1097	goto cleanup;
1098	}
1099
1100	/* Setup the rndis set */
1101	init = &request->request_msg.msg.init_req;
1102	init->major_ver = RNDIS_MAJOR_VERSION;
1103	init->minor_ver = RNDIS_MINOR_VERSION;
1104	init->max_xfer_size = 0x4000;
1105
1106	dev->state = RNDIS_DEV_INITIALIZING;
1107
1108	ret = rndis_filter_send_request(dev, req: request);
1109	if (ret != 0) {
1110	dev->state = RNDIS_DEV_UNINITIALIZED;
1111	goto cleanup;
1112	}
1113
1114	wait_for_completion(&request->wait_event);
1115
1116	init_complete = &request->response_msg.msg.init_complete;
1117	status = init_complete->status;
1118	if (status == RNDIS_STATUS_SUCCESS) {
1119	dev->state = RNDIS_DEV_INITIALIZED;
1120	nvdev->max_pkt = init_complete->max_pkt_per_msg;
1121	nvdev->pkt_align = 1 << init_complete->pkt_alignment_factor;
1122	ret = 0;
1123	} else {
1124	dev->state = RNDIS_DEV_UNINITIALIZED;
1125	ret = -EINVAL;
1126	}
1127
1128	cleanup:
1129	if (request)
1130	put_rndis_request(dev, req: request);
1131
1132	return ret;
1133	}
1134
1135	static bool netvsc_device_idle(const struct netvsc_device *nvdev)
1136	{
1137	int i;
1138
1139	for (i = 0; i < nvdev->num_chn; i++) {
1140	const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
1141
1142	if (nvchan->mrc.first != nvchan->mrc.next)
1143	return false;
1144
1145	if (atomic_read(v: &nvchan->queue_sends) > 0)
1146	return false;
1147	}
1148
1149	return true;
1150	}
1151
1152	static void rndis_filter_halt_device(struct netvsc_device *nvdev,
1153	struct rndis_device *dev)
1154	{
1155	struct rndis_request *request;
1156	struct rndis_halt_request *halt;
1157
1158	/* Attempt to do a rndis device halt */
1159	request = get_rndis_request(dev, RNDIS_MSG_HALT,
1160	RNDIS_MESSAGE_SIZE(struct rndis_halt_request));
1161	if (!request)
1162	goto cleanup;
1163
1164	/* Setup the rndis set */
1165	halt = &request->request_msg.msg.halt_req;
1166	halt->req_id = atomic_inc_return(v: &dev->new_req_id);
1167
1168	/* Ignore return since this msg is optional. */
1169	rndis_filter_send_request(dev, req: request);
1170
1171	dev->state = RNDIS_DEV_UNINITIALIZED;
1172
1173	cleanup:
1174	nvdev->destroy = true;
1175
1176	/* Force flag to be ordered before waiting */
1177	wmb();
1178
1179	/* Wait for all send completions */
1180	wait_event(nvdev->wait_drain, netvsc_device_idle(nvdev));
1181
1182	if (request)
1183	put_rndis_request(dev, req: request);
1184	}
1185
1186	static int rndis_filter_open_device(struct rndis_device *dev)
1187	{
1188	int ret;
1189
1190	if (dev->state != RNDIS_DEV_INITIALIZED)
1191	return 0;
1192
1193	ret = rndis_filter_set_packet_filter(dev,
1194	NDIS_PACKET_TYPE_BROADCAST |
1195	NDIS_PACKET_TYPE_ALL_MULTICAST |
1196	NDIS_PACKET_TYPE_DIRECTED);
1197	if (ret == 0)
1198	dev->state = RNDIS_DEV_DATAINITIALIZED;
1199
1200	return ret;
1201	}
1202
1203	static int rndis_filter_close_device(struct rndis_device *dev)
1204	{
1205	int ret;
1206
1207	if (dev->state != RNDIS_DEV_DATAINITIALIZED)
1208	return 0;
1209
1210	/* Make sure rndis_set_multicast doesn't re-enable filter! */
1211	cancel_work_sync(work: &dev->mcast_work);
1212
1213	ret = rndis_filter_set_packet_filter(dev, new_filter: 0);
1214	if (ret == -ENODEV)
1215	ret = 0;
1216
1217	if (ret == 0)
1218	dev->state = RNDIS_DEV_INITIALIZED;
1219
1220	return ret;
1221	}
1222
1223	static void netvsc_sc_open(struct vmbus_channel *new_sc)
1224	{
1225	struct net_device *ndev =
1226	hv_get_drvdata(dev: new_sc->primary_channel->device_obj);
1227	struct net_device_context *ndev_ctx = netdev_priv(dev: ndev);
1228	struct netvsc_device *nvscdev;
1229	u16 chn_index = new_sc->offermsg.offer.sub_channel_index;
1230	struct netvsc_channel *nvchan;
1231	int ret;
1232
1233	/* This is safe because this callback only happens when
1234	* new device is being setup and waiting on the channel_init_wait.
1235	*/
1236	nvscdev = rcu_dereference_raw(ndev_ctx->nvdev);
1237	if (!nvscdev || chn_index >= nvscdev->num_chn)
1238	return;
1239
1240	nvchan = nvscdev->chan_table + chn_index;
1241
1242	/* Because the device uses NAPI, all the interrupt batching and
1243	* control is done via Net softirq, not the channel handling
1244	*/
1245	set_channel_read_mode(c: new_sc, mode: HV_CALL_ISR);
1246
1247	/* Set the channel before opening.*/
1248	nvchan->channel = new_sc;
1249
1250	new_sc->next_request_id_callback = vmbus_next_request_id;
1251	new_sc->request_addr_callback = vmbus_request_addr;
1252	new_sc->rqstor_size = netvsc_rqstor_size(ringbytes: netvsc_ring_bytes);
1253	new_sc->max_pkt_size = NETVSC_MAX_PKT_SIZE;
1254
1255	/* Enable napi before opening the vmbus channel to avoid races
1256	* as the host placing data on the host->guest ring may be left
1257	* out if napi was not enabled.
1258	*/
1259	napi_enable(n: &nvchan->napi);
1260	netif_queue_set_napi(dev: ndev, queue_index: chn_index, type: NETDEV_QUEUE_TYPE_RX,
1261	napi: &nvchan->napi);
1262	netif_queue_set_napi(dev: ndev, queue_index: chn_index, type: NETDEV_QUEUE_TYPE_TX,
1263	napi: &nvchan->napi);
1264
1265	ret = vmbus_open(channel: new_sc, send_ringbuffersize: netvsc_ring_bytes,
1266	recv_ringbuffersize: netvsc_ring_bytes, NULL, userdatalen: 0,
1267	onchannel_callback: netvsc_channel_cb, context: nvchan);
1268	if (ret != 0) {
1269	netdev_notice(dev: ndev, format: "sub channel open failed: %d\n", ret);
1270	netif_queue_set_napi(dev: ndev, queue_index: chn_index, type: NETDEV_QUEUE_TYPE_TX,
1271	NULL);
1272	netif_queue_set_napi(dev: ndev, queue_index: chn_index, type: NETDEV_QUEUE_TYPE_RX,
1273	NULL);
1274	napi_disable(n: &nvchan->napi);
1275	}
1276
1277	if (atomic_inc_return(v: &nvscdev->open_chn) == nvscdev->num_chn)
1278	wake_up(&nvscdev->subchan_open);
1279	}
1280
1281	/* Open sub-channels after completing the handling of the device probe.
1282	* This breaks overlap of processing the host message for the
1283	* new primary channel with the initialization of sub-channels.
1284	*/
1285	int rndis_set_subchannel(struct net_device *ndev,
1286	struct netvsc_device *nvdev,
1287	struct netvsc_device_info *dev_info)
1288	{
1289	struct nvsp_message *init_packet = &nvdev->channel_init_pkt;
1290	struct net_device_context *ndev_ctx = netdev_priv(dev: ndev);
1291	struct hv_device *hv_dev = ndev_ctx->device_ctx;
1292	struct rndis_device *rdev = nvdev->extension;
1293	int i, ret;
1294
1295	ASSERT_RTNL();
1296
1297	memset(init_packet, 0, sizeof(struct nvsp_message));
1298	init_packet->hdr.msg_type = NVSP_MSG5_TYPE_SUBCHANNEL;
1299	init_packet->msg.v5_msg.subchn_req.op = NVSP_SUBCHANNEL_ALLOCATE;
1300	init_packet->msg.v5_msg.subchn_req.num_subchannels =
1301	nvdev->num_chn - 1;
1302	trace_nvsp_send(ndev, msg: init_packet);
1303
1304	ret = vmbus_sendpacket(channel: hv_dev->channel, buffer: init_packet,
1305	bufferLen: sizeof(struct nvsp_message),
1306	requestid: (unsigned long)init_packet,
1307	type: VM_PKT_DATA_INBAND,
1308	VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
1309	if (ret) {
1310	netdev_err(dev: ndev, format: "sub channel allocate send failed: %d\n", ret);
1311	return ret;
1312	}
1313
1314	wait_for_completion(&nvdev->channel_init_wait);
1315	if (init_packet->msg.v5_msg.subchn_comp.status != NVSP_STAT_SUCCESS) {
1316	netdev_err(dev: ndev, format: "sub channel request failed\n");
1317	return -EIO;
1318	}
1319
1320	/* Check that number of allocated sub channel is within the expected range */
1321	if (init_packet->msg.v5_msg.subchn_comp.num_subchannels > nvdev->num_chn - 1) {
1322	netdev_err(dev: ndev, format: "invalid number of allocated sub channel\n");
1323	return -EINVAL;
1324	}
1325	nvdev->num_chn = 1 +
1326	init_packet->msg.v5_msg.subchn_comp.num_subchannels;
1327
1328	/* wait for all sub channels to open */
1329	wait_event(nvdev->subchan_open,
1330	atomic_read(&nvdev->open_chn) == nvdev->num_chn);
1331
1332	for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1333	ndev_ctx->tx_table[i] = i % nvdev->num_chn;
1334
1335	/* ignore failures from setting rss parameters, still have channels */
1336	if (dev_info)
1337	rndis_filter_set_rss_param(rdev, rss_key: dev_info->rss_key);
1338	else
1339	rndis_filter_set_rss_param(rdev, rss_key: netvsc_hash_key);
1340
1341	netif_set_real_num_tx_queues(dev: ndev, txq: nvdev->num_chn);
1342	netif_set_real_num_rx_queues(dev: ndev, rxq: nvdev->num_chn);
1343
1344	return 0;
1345	}
1346
1347	static int rndis_netdev_set_hwcaps(struct rndis_device *rndis_device,
1348	struct netvsc_device *nvdev)
1349	{
1350	struct net_device *net = rndis_device->ndev;
1351	struct net_device_context *net_device_ctx = netdev_priv(dev: net);
1352	struct ndis_offload hwcaps;
1353	struct ndis_offload_params offloads;
1354	int ret;
1355
1356	nvdev->netvsc_gso_max_size = GSO_LEGACY_MAX_SIZE;
1357
1358	/* Find HW offload capabilities */
1359	ret = rndis_query_hwcaps(dev: rndis_device, net_device: nvdev, caps: &hwcaps);
1360	if (ret != 0)
1361	return ret;
1362
1363	/* A value of zero means "no change"; now turn on what we want. */
1364	memset(&offloads, 0, sizeof(struct ndis_offload_params));
1365
1366	/* Linux does not care about IP checksum, always does in kernel */
1367	offloads.ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_DISABLED;
1368
1369	/* Reset previously set hw_features flags */
1370	net->hw_features &= ~NETVSC_SUPPORTED_HW_FEATURES;
1371	net_device_ctx->tx_checksum_mask = 0;
1372
1373	/* Compute tx offload settings based on hw capabilities */
1374	net->hw_features |= NETIF_F_RXCSUM;
1375	net->hw_features |= NETIF_F_SG;
1376	net->hw_features |= NETIF_F_RXHASH;
1377
1378	if ((hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_ALL_TCP4) == NDIS_TXCSUM_ALL_TCP4) {
1379	/* Can checksum TCP */
1380	net->hw_features |= NETIF_F_IP_CSUM;
1381	net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_TCP;
1382
1383	offloads.tcp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1384
1385	if (hwcaps.lsov2.ip4_encap & NDIS_OFFLOAD_ENCAP_8023) {
1386	offloads.lso_v2_ipv4 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1387	net->hw_features |= NETIF_F_TSO;
1388
1389	if (hwcaps.lsov2.ip4_maxsz < nvdev->netvsc_gso_max_size)
1390	nvdev->netvsc_gso_max_size = hwcaps.lsov2.ip4_maxsz;
1391	}
1392
1393	if (hwcaps.csum.ip4_txcsum & NDIS_TXCSUM_CAP_UDP4) {
1394	offloads.udp_ip_v4_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1395	net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV4_UDP;
1396	}
1397	}
1398
1399	if ((hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_ALL_TCP6) == NDIS_TXCSUM_ALL_TCP6) {
1400	net->hw_features |= NETIF_F_IPV6_CSUM;
1401
1402	offloads.tcp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1403	net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_TCP;
1404
1405	if ((hwcaps.lsov2.ip6_encap & NDIS_OFFLOAD_ENCAP_8023) &&
1406	(hwcaps.lsov2.ip6_opts & NDIS_LSOV2_CAP_IP6) == NDIS_LSOV2_CAP_IP6) {
1407	offloads.lso_v2_ipv6 = NDIS_OFFLOAD_PARAMETERS_LSOV2_ENABLED;
1408	net->hw_features |= NETIF_F_TSO6;
1409
1410	if (hwcaps.lsov2.ip6_maxsz < nvdev->netvsc_gso_max_size)
1411	nvdev->netvsc_gso_max_size = hwcaps.lsov2.ip6_maxsz;
1412	}
1413
1414	if (hwcaps.csum.ip6_txcsum & NDIS_TXCSUM_CAP_UDP6) {
1415	offloads.udp_ip_v6_csum = NDIS_OFFLOAD_PARAMETERS_TX_RX_ENABLED;
1416	net_device_ctx->tx_checksum_mask |= TRANSPORT_INFO_IPV6_UDP;
1417	}
1418	}
1419
1420	if (hwcaps.rsc.ip4 && hwcaps.rsc.ip6) {
1421	net->hw_features |= NETIF_F_LRO;
1422
1423	if (net->features & NETIF_F_LRO) {
1424	offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1425	offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
1426	} else {
1427	offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1428	offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
1429	}
1430	}
1431
1432	/* In case some hw_features disappeared we need to remove them from
1433	* net->features list as they're no longer supported.
1434	*/
1435	net->features &= ~NETVSC_SUPPORTED_HW_FEATURES | net->hw_features;
1436
1437	netif_set_tso_max_size(dev: net, size: nvdev->netvsc_gso_max_size);
1438
1439	ret = rndis_filter_set_offload_params(ndev: net, nvdev, req_offloads: &offloads);
1440
1441	return ret;
1442	}
1443
1444	static void rndis_get_friendly_name(struct net_device *net,
1445	struct rndis_device *rndis_device,
1446	struct netvsc_device *net_device)
1447	{
1448	ucs2_char_t wname[256];
1449	unsigned long len;
1450	u8 ifalias[256];
1451	u32 size;
1452
1453	size = sizeof(wname);
1454	if (rndis_filter_query_device(dev: rndis_device, nvdev: net_device,
1455	RNDIS_OID_GEN_FRIENDLY_NAME,
1456	result: wname, result_size: &size) != 0)
1457	return; /* ignore if host does not support */
1458
1459	if (size == 0)
1460	return; /* name not set */
1461
1462	/* Convert Windows Unicode string to UTF-8 */
1463	len = ucs2_as_utf8(dest: ifalias, src: wname, maxlength: sizeof(ifalias));
1464
1465	/* ignore the default value from host */
1466	if (strcmp(ifalias, "Network Adapter") != 0)
1467	dev_set_alias(net, ifalias, len);
1468	}
1469
1470	struct netvsc_device *rndis_filter_device_add(struct hv_device *dev,
1471	struct netvsc_device_info *device_info)
1472	{
1473	struct net_device *net = hv_get_drvdata(dev);
1474	struct net_device_context *ndc = netdev_priv(dev: net);
1475	struct netvsc_device *net_device;
1476	struct rndis_device *rndis_device;
1477	struct ndis_recv_scale_cap rsscap;
1478	u32 rsscap_size = sizeof(struct ndis_recv_scale_cap);
1479	u32 mtu, size;
1480	u32 num_possible_rss_qs;
1481	int i, ret;
1482
1483	rndis_device = get_rndis_device();
1484	if (!rndis_device)
1485	return ERR_PTR(error: -ENODEV);
1486
1487	/* Let the inner driver handle this first to create the netvsc channel
1488	* NOTE! Once the channel is created, we may get a receive callback
1489	* (RndisFilterOnReceive()) before this call is completed
1490	*/
1491	net_device = netvsc_device_add(device: dev, info: device_info);
1492	if (IS_ERR(ptr: net_device)) {
1493	kfree(objp: rndis_device);
1494	return net_device;
1495	}
1496
1497	/* Initialize the rndis device */
1498	net_device->max_chn = 1;
1499	net_device->num_chn = 1;
1500
1501	net_device->extension = rndis_device;
1502	rndis_device->ndev = net;
1503
1504	/* Send the rndis initialization message */
1505	ret = rndis_filter_init_device(dev: rndis_device, nvdev: net_device);
1506	if (ret != 0)
1507	goto err_dev_remv;
1508
1509	/* Get the MTU from the host */
1510	size = sizeof(u32);
1511	ret = rndis_filter_query_device(dev: rndis_device, nvdev: net_device,
1512	RNDIS_OID_GEN_MAXIMUM_FRAME_SIZE,
1513	result: &mtu, result_size: &size);
1514	if (ret == 0 && size == sizeof(u32) && mtu < net->mtu)
1515	net->mtu = mtu;
1516
1517	/* Get the mac address */
1518	ret = rndis_filter_query_device_mac(dev: rndis_device, net_device);
1519	if (ret != 0)
1520	goto err_dev_remv;
1521
1522	memcpy(device_info->mac_adr, rndis_device->hw_mac_adr, ETH_ALEN);
1523
1524	/* Get friendly name as ifalias*/
1525	if (!net->ifalias)
1526	rndis_get_friendly_name(net, rndis_device, net_device);
1527
1528	/* Query and set hardware capabilities */
1529	ret = rndis_netdev_set_hwcaps(rndis_device, nvdev: net_device);
1530	if (ret != 0)
1531	goto err_dev_remv;
1532
1533	rndis_filter_query_device_link_status(dev: rndis_device, net_device);
1534
1535	netdev_dbg(net, "Device MAC %pM link state %s\n",
1536	rndis_device->hw_mac_adr,
1537	rndis_device->link_state ? "down" : "up");
1538
1539	if (net_device->nvsp_version < NVSP_PROTOCOL_VERSION_5)
1540	goto out;
1541
1542	rndis_filter_query_link_speed(dev: rndis_device, net_device);
1543
1544	/* vRSS setup */
1545	memset(&rsscap, 0, rsscap_size);
1546	ret = rndis_filter_query_device(dev: rndis_device, nvdev: net_device,
1547	OID_GEN_RECEIVE_SCALE_CAPABILITIES,
1548	result: &rsscap, result_size: &rsscap_size);
1549	if (ret || rsscap.num_recv_que < 2)
1550	goto out;
1551
1552	if (rsscap.num_indirect_tabent &&
1553	rsscap.num_indirect_tabent <= ITAB_NUM_MAX)
1554	ndc->rx_table_sz = rsscap.num_indirect_tabent;
1555	else
1556	ndc->rx_table_sz = ITAB_NUM;
1557
1558	ndc->rx_table = kcalloc(ndc->rx_table_sz, sizeof(u16), GFP_KERNEL);
1559	if (!ndc->rx_table) {
1560	ret = -ENOMEM;
1561	goto err_dev_remv;
1562	}
1563
1564	/* This guarantees that num_possible_rss_qs <= num_online_cpus */
1565	num_possible_rss_qs = min_t(u32, num_online_cpus(),
1566	rsscap.num_recv_que);
1567
1568	net_device->max_chn = min_t(u32, VRSS_CHANNEL_MAX, num_possible_rss_qs);
1569
1570	/* We will use the given number of channels if available. */
1571	net_device->num_chn = min(net_device->max_chn, device_info->num_chn);
1572
1573	if (!netif_is_rxfh_configured(dev: net)) {
1574	for (i = 0; i < ndc->rx_table_sz; i++)
1575	ndc->rx_table[i] = ethtool_rxfh_indir_default(
1576	index: i, n_rx_rings: net_device->num_chn);
1577	}
1578
1579	atomic_set(v: &net_device->open_chn, i: 1);
1580	vmbus_set_sc_create_callback(primary_channel: dev->channel, sc_cr_cb: netvsc_sc_open);
1581
1582	for (i = 1; i < net_device->num_chn; i++) {
1583	ret = netvsc_alloc_recv_comp_ring(net_device, q_idx: i);
1584	if (ret) {
1585	while (--i != 0)
1586	vfree(addr: net_device->chan_table[i].mrc.slots);
1587	goto out;
1588	}
1589	}
1590
1591	for (i = 1; i < net_device->num_chn; i++)
1592	netif_napi_add(dev: net, napi: &net_device->chan_table[i].napi,
1593	poll: netvsc_poll);
1594
1595	return net_device;
1596
1597	out:
1598	/* setting up multiple channels failed */
1599	net_device->max_chn = 1;
1600	net_device->num_chn = 1;
1601	return net_device;
1602
1603	err_dev_remv:
1604	rndis_filter_device_remove(dev, nvdev: net_device);
1605	return ERR_PTR(error: ret);
1606	}
1607
1608	void rndis_filter_device_remove(struct hv_device *dev,
1609	struct netvsc_device *net_dev)
1610	{
1611	struct rndis_device *rndis_dev = net_dev->extension;
1612	struct net_device *net = hv_get_drvdata(dev);
1613	struct net_device_context *ndc;
1614
1615	ndc = netdev_priv(dev: net);
1616
1617	/* Halt and release the rndis device */
1618	rndis_filter_halt_device(nvdev: net_dev, dev: rndis_dev);
1619
1620	netvsc_device_remove(device: dev);
1621
1622	ndc->rx_table_sz = 0;
1623	kfree(objp: ndc->rx_table);
1624	ndc->rx_table = NULL;
1625	}
1626
1627	int rndis_filter_open(struct netvsc_device *nvdev)
1628	{
1629	if (!nvdev)
1630	return -EINVAL;
1631
1632	return rndis_filter_open_device(dev: nvdev->extension);
1633	}
1634
1635	int rndis_filter_close(struct netvsc_device *nvdev)
1636	{
1637	if (!nvdev)
1638	return -EINVAL;
1639
1640	return rndis_filter_close_device(dev: nvdev->extension);
1641	}
1642