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