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1/*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, see <http://www.gnu.org/licenses/>.
15 *
16 * Authors:
17 * Haiyang Zhang <haiyangz@microsoft.com>
18 * Hank Janssen <hjanssen@microsoft.com>
19 */
20#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21
22#include <linux/kernel.h>
23#include <linux/sched.h>
24#include <linux/wait.h>
25#include <linux/mm.h>
26#include <linux/delay.h>
27#include <linux/io.h>
28#include <linux/slab.h>
29#include <linux/netdevice.h>
30#include <linux/if_ether.h>
31#include <linux/vmalloc.h>
32#include <linux/rtnetlink.h>
33#include <linux/prefetch.h>
34#include <linux/reciprocal_div.h>
35
36#include <asm/sync_bitops.h>
37
38#include "hyperv_net.h"
39#include "netvsc_trace.h"
40
41/*
42 * Switch the data path from the synthetic interface to the VF
43 * interface.
44 */
45void netvsc_switch_datapath(struct net_device *ndev, bool vf)
46{
47 struct net_device_context *net_device_ctx = netdev_priv(ndev);
48 struct hv_device *dev = net_device_ctx->device_ctx;
49 struct netvsc_device *nv_dev = rtnl_dereference(net_device_ctx->nvdev);
50 struct nvsp_message *init_pkt = &nv_dev->channel_init_pkt;
51
52 memset(init_pkt, 0, sizeof(struct nvsp_message));
53 init_pkt->hdr.msg_type = NVSP_MSG4_TYPE_SWITCH_DATA_PATH;
54 if (vf)
55 init_pkt->msg.v4_msg.active_dp.active_datapath =
56 NVSP_DATAPATH_VF;
57 else
58 init_pkt->msg.v4_msg.active_dp.active_datapath =
59 NVSP_DATAPATH_SYNTHETIC;
60
61 trace_nvsp_send(ndev, init_pkt);
62
63 vmbus_sendpacket(dev->channel, init_pkt,
64 sizeof(struct nvsp_message),
65 (unsigned long)init_pkt,
66 VM_PKT_DATA_INBAND, 0);
67}
68
69static struct netvsc_device *alloc_net_device(void)
70{
71 struct netvsc_device *net_device;
72
73 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
74 if (!net_device)
75 return NULL;
76
77 init_waitqueue_head(&net_device->wait_drain);
78 net_device->destroy = false;
79
80 net_device->max_pkt = RNDIS_MAX_PKT_DEFAULT;
81 net_device->pkt_align = RNDIS_PKT_ALIGN_DEFAULT;
82
83 init_completion(&net_device->channel_init_wait);
84 init_waitqueue_head(&net_device->subchan_open);
85 INIT_WORK(&net_device->subchan_work, rndis_set_subchannel);
86
87 return net_device;
88}
89
90static void free_netvsc_device(struct rcu_head *head)
91{
92 struct netvsc_device *nvdev
93 = container_of(head, struct netvsc_device, rcu);
94 int i;
95
96 kfree(nvdev->extension);
97 vfree(nvdev->recv_buf);
98 vfree(nvdev->send_buf);
99 kfree(nvdev->send_section_map);
100
101 for (i = 0; i < VRSS_CHANNEL_MAX; i++)
102 vfree(nvdev->chan_table[i].mrc.slots);
103
104 kfree(nvdev);
105}
106
107static void free_netvsc_device_rcu(struct netvsc_device *nvdev)
108{
109 call_rcu(&nvdev->rcu, free_netvsc_device);
110}
111
112static void netvsc_revoke_recv_buf(struct hv_device *device,
113 struct netvsc_device *net_device,
114 struct net_device *ndev)
115{
116 struct nvsp_message *revoke_packet;
117 int ret;
118
119 /*
120 * If we got a section count, it means we received a
121 * SendReceiveBufferComplete msg (ie sent
122 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
123 * to send a revoke msg here
124 */
125 if (net_device->recv_section_cnt) {
126 /* Send the revoke receive buffer */
127 revoke_packet = &net_device->revoke_packet;
128 memset(revoke_packet, 0, sizeof(struct nvsp_message));
129
130 revoke_packet->hdr.msg_type =
131 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
132 revoke_packet->msg.v1_msg.
133 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
134
135 trace_nvsp_send(ndev, revoke_packet);
136
137 ret = vmbus_sendpacket(device->channel,
138 revoke_packet,
139 sizeof(struct nvsp_message),
140 (unsigned long)revoke_packet,
141 VM_PKT_DATA_INBAND, 0);
142 /* If the failure is because the channel is rescinded;
143 * ignore the failure since we cannot send on a rescinded
144 * channel. This would allow us to properly cleanup
145 * even when the channel is rescinded.
146 */
147 if (device->channel->rescind)
148 ret = 0;
149 /*
150 * If we failed here, we might as well return and
151 * have a leak rather than continue and a bugchk
152 */
153 if (ret != 0) {
154 netdev_err(ndev, "unable to send "
155 "revoke receive buffer to netvsp\n");
156 return;
157 }
158 net_device->recv_section_cnt = 0;
159 }
160}
161
162static void netvsc_revoke_send_buf(struct hv_device *device,
163 struct netvsc_device *net_device,
164 struct net_device *ndev)
165{
166 struct nvsp_message *revoke_packet;
167 int ret;
168
169 /* Deal with the send buffer we may have setup.
170 * If we got a send section size, it means we received a
171 * NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE msg (ie sent
172 * NVSP_MSG1_TYPE_SEND_SEND_BUF msg) therefore, we need
173 * to send a revoke msg here
174 */
175 if (net_device->send_section_cnt) {
176 /* Send the revoke receive buffer */
177 revoke_packet = &net_device->revoke_packet;
178 memset(revoke_packet, 0, sizeof(struct nvsp_message));
179
180 revoke_packet->hdr.msg_type =
181 NVSP_MSG1_TYPE_REVOKE_SEND_BUF;
182 revoke_packet->msg.v1_msg.revoke_send_buf.id =
183 NETVSC_SEND_BUFFER_ID;
184
185 trace_nvsp_send(ndev, revoke_packet);
186
187 ret = vmbus_sendpacket(device->channel,
188 revoke_packet,
189 sizeof(struct nvsp_message),
190 (unsigned long)revoke_packet,
191 VM_PKT_DATA_INBAND, 0);
192
193 /* If the failure is because the channel is rescinded;
194 * ignore the failure since we cannot send on a rescinded
195 * channel. This would allow us to properly cleanup
196 * even when the channel is rescinded.
197 */
198 if (device->channel->rescind)
199 ret = 0;
200
201 /* If we failed here, we might as well return and
202 * have a leak rather than continue and a bugchk
203 */
204 if (ret != 0) {
205 netdev_err(ndev, "unable to send "
206 "revoke send buffer to netvsp\n");
207 return;
208 }
209 net_device->send_section_cnt = 0;
210 }
211}
212
213static void netvsc_teardown_recv_gpadl(struct hv_device *device,
214 struct netvsc_device *net_device,
215 struct net_device *ndev)
216{
217 int ret;
218
219 if (net_device->recv_buf_gpadl_handle) {
220 ret = vmbus_teardown_gpadl(device->channel,
221 net_device->recv_buf_gpadl_handle);
222
223 /* If we failed here, we might as well return and have a leak
224 * rather than continue and a bugchk
225 */
226 if (ret != 0) {
227 netdev_err(ndev,
228 "unable to teardown receive buffer's gpadl\n");
229 return;
230 }
231 net_device->recv_buf_gpadl_handle = 0;
232 }
233}
234
235static void netvsc_teardown_send_gpadl(struct hv_device *device,
236 struct netvsc_device *net_device,
237 struct net_device *ndev)
238{
239 int ret;
240
241 if (net_device->send_buf_gpadl_handle) {
242 ret = vmbus_teardown_gpadl(device->channel,
243 net_device->send_buf_gpadl_handle);
244
245 /* If we failed here, we might as well return and have a leak
246 * rather than continue and a bugchk
247 */
248 if (ret != 0) {
249 netdev_err(ndev,
250 "unable to teardown send buffer's gpadl\n");
251 return;
252 }
253 net_device->send_buf_gpadl_handle = 0;
254 }
255}
256
257int netvsc_alloc_recv_comp_ring(struct netvsc_device *net_device, u32 q_idx)
258{
259 struct netvsc_channel *nvchan = &net_device->chan_table[q_idx];
260 int node = cpu_to_node(nvchan->channel->target_cpu);
261 size_t size;
262
263 size = net_device->recv_completion_cnt * sizeof(struct recv_comp_data);
264 nvchan->mrc.slots = vzalloc_node(size, node);
265 if (!nvchan->mrc.slots)
266 nvchan->mrc.slots = vzalloc(size);
267
268 return nvchan->mrc.slots ? 0 : -ENOMEM;
269}
270
271static int netvsc_init_buf(struct hv_device *device,
272 struct netvsc_device *net_device,
273 const struct netvsc_device_info *device_info)
274{
275 struct nvsp_1_message_send_receive_buffer_complete *resp;
276 struct net_device *ndev = hv_get_drvdata(device);
277 struct nvsp_message *init_packet;
278 unsigned int buf_size;
279 size_t map_words;
280 int ret = 0;
281
282 /* Get receive buffer area. */
283 buf_size = device_info->recv_sections * device_info->recv_section_size;
284 buf_size = roundup(buf_size, PAGE_SIZE);
285
286 /* Legacy hosts only allow smaller receive buffer */
287 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
288 buf_size = min_t(unsigned int, buf_size,
289 NETVSC_RECEIVE_BUFFER_SIZE_LEGACY);
290
291 net_device->recv_buf = vzalloc(buf_size);
292 if (!net_device->recv_buf) {
293 netdev_err(ndev,
294 "unable to allocate receive buffer of size %u\n",
295 buf_size);
296 ret = -ENOMEM;
297 goto cleanup;
298 }
299
300 net_device->recv_buf_size = buf_size;
301
302 /*
303 * Establish the gpadl handle for this buffer on this
304 * channel. Note: This call uses the vmbus connection rather
305 * than the channel to establish the gpadl handle.
306 */
307 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
308 buf_size,
309 &net_device->recv_buf_gpadl_handle);
310 if (ret != 0) {
311 netdev_err(ndev,
312 "unable to establish receive buffer's gpadl\n");
313 goto cleanup;
314 }
315
316 /* Notify the NetVsp of the gpadl handle */
317 init_packet = &net_device->channel_init_pkt;
318 memset(init_packet, 0, sizeof(struct nvsp_message));
319 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
320 init_packet->msg.v1_msg.send_recv_buf.
321 gpadl_handle = net_device->recv_buf_gpadl_handle;
322 init_packet->msg.v1_msg.
323 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
324
325 trace_nvsp_send(ndev, init_packet);
326
327 /* Send the gpadl notification request */
328 ret = vmbus_sendpacket(device->channel, init_packet,
329 sizeof(struct nvsp_message),
330 (unsigned long)init_packet,
331 VM_PKT_DATA_INBAND,
332 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
333 if (ret != 0) {
334 netdev_err(ndev,
335 "unable to send receive buffer's gpadl to netvsp\n");
336 goto cleanup;
337 }
338
339 wait_for_completion(&net_device->channel_init_wait);
340
341 /* Check the response */
342 resp = &init_packet->msg.v1_msg.send_recv_buf_complete;
343 if (resp->status != NVSP_STAT_SUCCESS) {
344 netdev_err(ndev,
345 "Unable to complete receive buffer initialization with NetVsp - status %d\n",
346 resp->status);
347 ret = -EINVAL;
348 goto cleanup;
349 }
350
351 /* Parse the response */
352 netdev_dbg(ndev, "Receive sections: %u sub_allocs: size %u count: %u\n",
353 resp->num_sections, resp->sections[0].sub_alloc_size,
354 resp->sections[0].num_sub_allocs);
355
356 /* There should only be one section for the entire receive buffer */
357 if (resp->num_sections != 1 || resp->sections[0].offset != 0) {
358 ret = -EINVAL;
359 goto cleanup;
360 }
361
362 net_device->recv_section_size = resp->sections[0].sub_alloc_size;
363 net_device->recv_section_cnt = resp->sections[0].num_sub_allocs;
364
365 /* Setup receive completion ring */
366 net_device->recv_completion_cnt
367 = round_up(net_device->recv_section_cnt + 1,
368 PAGE_SIZE / sizeof(u64));
369 ret = netvsc_alloc_recv_comp_ring(net_device, 0);
370 if (ret)
371 goto cleanup;
372
373 /* Now setup the send buffer. */
374 buf_size = device_info->send_sections * device_info->send_section_size;
375 buf_size = round_up(buf_size, PAGE_SIZE);
376
377 net_device->send_buf = vzalloc(buf_size);
378 if (!net_device->send_buf) {
379 netdev_err(ndev, "unable to allocate send buffer of size %u\n",
380 buf_size);
381 ret = -ENOMEM;
382 goto cleanup;
383 }
384
385 /* Establish the gpadl handle for this buffer on this
386 * channel. Note: This call uses the vmbus connection rather
387 * than the channel to establish the gpadl handle.
388 */
389 ret = vmbus_establish_gpadl(device->channel, net_device->send_buf,
390 buf_size,
391 &net_device->send_buf_gpadl_handle);
392 if (ret != 0) {
393 netdev_err(ndev,
394 "unable to establish send buffer's gpadl\n");
395 goto cleanup;
396 }
397
398 /* Notify the NetVsp of the gpadl handle */
399 init_packet = &net_device->channel_init_pkt;
400 memset(init_packet, 0, sizeof(struct nvsp_message));
401 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_SEND_BUF;
402 init_packet->msg.v1_msg.send_send_buf.gpadl_handle =
403 net_device->send_buf_gpadl_handle;
404 init_packet->msg.v1_msg.send_send_buf.id = NETVSC_SEND_BUFFER_ID;
405
406 trace_nvsp_send(ndev, init_packet);
407
408 /* Send the gpadl notification request */
409 ret = vmbus_sendpacket(device->channel, init_packet,
410 sizeof(struct nvsp_message),
411 (unsigned long)init_packet,
412 VM_PKT_DATA_INBAND,
413 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
414 if (ret != 0) {
415 netdev_err(ndev,
416 "unable to send send buffer's gpadl to netvsp\n");
417 goto cleanup;
418 }
419
420 wait_for_completion(&net_device->channel_init_wait);
421
422 /* Check the response */
423 if (init_packet->msg.v1_msg.
424 send_send_buf_complete.status != NVSP_STAT_SUCCESS) {
425 netdev_err(ndev, "Unable to complete send buffer "
426 "initialization with NetVsp - status %d\n",
427 init_packet->msg.v1_msg.
428 send_send_buf_complete.status);
429 ret = -EINVAL;
430 goto cleanup;
431 }
432
433 /* Parse the response */
434 net_device->send_section_size = init_packet->msg.
435 v1_msg.send_send_buf_complete.section_size;
436
437 /* Section count is simply the size divided by the section size. */
438 net_device->send_section_cnt = buf_size / net_device->send_section_size;
439
440 netdev_dbg(ndev, "Send section size: %d, Section count:%d\n",
441 net_device->send_section_size, net_device->send_section_cnt);
442
443 /* Setup state for managing the send buffer. */
444 map_words = DIV_ROUND_UP(net_device->send_section_cnt, BITS_PER_LONG);
445
446 net_device->send_section_map = kcalloc(map_words, sizeof(ulong), GFP_KERNEL);
447 if (net_device->send_section_map == NULL) {
448 ret = -ENOMEM;
449 goto cleanup;
450 }
451
452 goto exit;
453
454cleanup:
455 netvsc_revoke_recv_buf(device, net_device, ndev);
456 netvsc_revoke_send_buf(device, net_device, ndev);
457 netvsc_teardown_recv_gpadl(device, net_device, ndev);
458 netvsc_teardown_send_gpadl(device, net_device, ndev);
459
460exit:
461 return ret;
462}
463
464/* Negotiate NVSP protocol version */
465static int negotiate_nvsp_ver(struct hv_device *device,
466 struct netvsc_device *net_device,
467 struct nvsp_message *init_packet,
468 u32 nvsp_ver)
469{
470 struct net_device *ndev = hv_get_drvdata(device);
471 int ret;
472
473 memset(init_packet, 0, sizeof(struct nvsp_message));
474 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
475 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
476 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
477 trace_nvsp_send(ndev, init_packet);
478
479 /* Send the init request */
480 ret = vmbus_sendpacket(device->channel, init_packet,
481 sizeof(struct nvsp_message),
482 (unsigned long)init_packet,
483 VM_PKT_DATA_INBAND,
484 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
485
486 if (ret != 0)
487 return ret;
488
489 wait_for_completion(&net_device->channel_init_wait);
490
491 if (init_packet->msg.init_msg.init_complete.status !=
492 NVSP_STAT_SUCCESS)
493 return -EINVAL;
494
495 if (nvsp_ver == NVSP_PROTOCOL_VERSION_1)
496 return 0;
497
498 /* NVSPv2 or later: Send NDIS config */
499 memset(init_packet, 0, sizeof(struct nvsp_message));
500 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
501 init_packet->msg.v2_msg.send_ndis_config.mtu = ndev->mtu + ETH_HLEN;
502 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
503
504 if (nvsp_ver >= NVSP_PROTOCOL_VERSION_5) {
505 init_packet->msg.v2_msg.send_ndis_config.capability.sriov = 1;
506
507 /* Teaming bit is needed to receive link speed updates */
508 init_packet->msg.v2_msg.send_ndis_config.capability.teaming = 1;
509 }
510
511 trace_nvsp_send(ndev, init_packet);
512
513 ret = vmbus_sendpacket(device->channel, init_packet,
514 sizeof(struct nvsp_message),
515 (unsigned long)init_packet,
516 VM_PKT_DATA_INBAND, 0);
517
518 return ret;
519}
520
521static int netvsc_connect_vsp(struct hv_device *device,
522 struct netvsc_device *net_device,
523 const struct netvsc_device_info *device_info)
524{
525 struct net_device *ndev = hv_get_drvdata(device);
526 static const u32 ver_list[] = {
527 NVSP_PROTOCOL_VERSION_1, NVSP_PROTOCOL_VERSION_2,
528 NVSP_PROTOCOL_VERSION_4, NVSP_PROTOCOL_VERSION_5
529 };
530 struct nvsp_message *init_packet;
531 int ndis_version, i, ret;
532
533 init_packet = &net_device->channel_init_pkt;
534
535 /* Negotiate the latest NVSP protocol supported */
536 for (i = ARRAY_SIZE(ver_list) - 1; i >= 0; i--)
537 if (negotiate_nvsp_ver(device, net_device, init_packet,
538 ver_list[i]) == 0) {
539 net_device->nvsp_version = ver_list[i];
540 break;
541 }
542
543 if (i < 0) {
544 ret = -EPROTO;
545 goto cleanup;
546 }
547
548 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
549
550 /* Send the ndis version */
551 memset(init_packet, 0, sizeof(struct nvsp_message));
552
553 if (net_device->nvsp_version <= NVSP_PROTOCOL_VERSION_4)
554 ndis_version = 0x00060001;
555 else
556 ndis_version = 0x0006001e;
557
558 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
559 init_packet->msg.v1_msg.
560 send_ndis_ver.ndis_major_ver =
561 (ndis_version & 0xFFFF0000) >> 16;
562 init_packet->msg.v1_msg.
563 send_ndis_ver.ndis_minor_ver =
564 ndis_version & 0xFFFF;
565
566 trace_nvsp_send(ndev, init_packet);
567
568 /* Send the init request */
569 ret = vmbus_sendpacket(device->channel, init_packet,
570 sizeof(struct nvsp_message),
571 (unsigned long)init_packet,
572 VM_PKT_DATA_INBAND, 0);
573 if (ret != 0)
574 goto cleanup;
575
576
577 ret = netvsc_init_buf(device, net_device, device_info);
578
579cleanup:
580 return ret;
581}
582
583/*
584 * netvsc_device_remove - Callback when the root bus device is removed
585 */
586void netvsc_device_remove(struct hv_device *device)
587{
588 struct net_device *ndev = hv_get_drvdata(device);
589 struct net_device_context *net_device_ctx = netdev_priv(ndev);
590 struct netvsc_device *net_device
591 = rtnl_dereference(net_device_ctx->nvdev);
592 int i;
593
594 /*
595 * Revoke receive buffer. If host is pre-Win2016 then tear down
596 * receive buffer GPADL. Do the same for send buffer.
597 */
598 netvsc_revoke_recv_buf(device, net_device, ndev);
599 if (vmbus_proto_version < VERSION_WIN10)
600 netvsc_teardown_recv_gpadl(device, net_device, ndev);
601
602 netvsc_revoke_send_buf(device, net_device, ndev);
603 if (vmbus_proto_version < VERSION_WIN10)
604 netvsc_teardown_send_gpadl(device, net_device, ndev);
605
606 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
607
608 /* And disassociate NAPI context from device */
609 for (i = 0; i < net_device->num_chn; i++)
610 netif_napi_del(&net_device->chan_table[i].napi);
611
612 /*
613 * At this point, no one should be accessing net_device
614 * except in here
615 */
616 netdev_dbg(ndev, "net device safe to remove\n");
617
618 /* Now, we can close the channel safely */
619 vmbus_close(device->channel);
620
621 /*
622 * If host is Win2016 or higher then we do the GPADL tear down
623 * here after VMBus is closed.
624 */
625 if (vmbus_proto_version >= VERSION_WIN10) {
626 netvsc_teardown_recv_gpadl(device, net_device, ndev);
627 netvsc_teardown_send_gpadl(device, net_device, ndev);
628 }
629
630 /* Release all resources */
631 free_netvsc_device_rcu(net_device);
632}
633
634#define RING_AVAIL_PERCENT_HIWATER 20
635#define RING_AVAIL_PERCENT_LOWATER 10
636
637/*
638 * Get the percentage of available bytes to write in the ring.
639 * The return value is in range from 0 to 100.
640 */
641static u32 hv_ringbuf_avail_percent(const struct hv_ring_buffer_info *ring_info)
642{
643 u32 avail_write = hv_get_bytes_to_write(ring_info);
644
645 return reciprocal_divide(avail_write * 100, netvsc_ring_reciprocal);
646}
647
648static inline void netvsc_free_send_slot(struct netvsc_device *net_device,
649 u32 index)
650{
651 sync_change_bit(index, net_device->send_section_map);
652}
653
654static void netvsc_send_tx_complete(struct netvsc_device *net_device,
655 struct vmbus_channel *incoming_channel,
656 struct hv_device *device,
657 const struct vmpacket_descriptor *desc,
658 int budget)
659{
660 struct sk_buff *skb = (struct sk_buff *)(unsigned long)desc->trans_id;
661 struct net_device *ndev = hv_get_drvdata(device);
662 struct net_device_context *ndev_ctx = netdev_priv(ndev);
663 struct vmbus_channel *channel = device->channel;
664 u16 q_idx = 0;
665 int queue_sends;
666
667 /* Notify the layer above us */
668 if (likely(skb)) {
669 const struct hv_netvsc_packet *packet
670 = (struct hv_netvsc_packet *)skb->cb;
671 u32 send_index = packet->send_buf_index;
672 struct netvsc_stats *tx_stats;
673
674 if (send_index != NETVSC_INVALID_INDEX)
675 netvsc_free_send_slot(net_device, send_index);
676 q_idx = packet->q_idx;
677 channel = incoming_channel;
678
679 tx_stats = &net_device->chan_table[q_idx].tx_stats;
680
681 u64_stats_update_begin(&tx_stats->syncp);
682 tx_stats->packets += packet->total_packets;
683 tx_stats->bytes += packet->total_bytes;
684 u64_stats_update_end(&tx_stats->syncp);
685
686 napi_consume_skb(skb, budget);
687 }
688
689 queue_sends =
690 atomic_dec_return(&net_device->chan_table[q_idx].queue_sends);
691
692 if (unlikely(net_device->destroy)) {
693 if (queue_sends == 0)
694 wake_up(&net_device->wait_drain);
695 } else {
696 struct netdev_queue *txq = netdev_get_tx_queue(ndev, q_idx);
697
698 if (netif_tx_queue_stopped(txq) &&
699 (hv_ringbuf_avail_percent(&channel->outbound) > RING_AVAIL_PERCENT_HIWATER ||
700 queue_sends < 1)) {
701 netif_tx_wake_queue(txq);
702 ndev_ctx->eth_stats.wake_queue++;
703 }
704 }
705}
706
707static void netvsc_send_completion(struct netvsc_device *net_device,
708 struct vmbus_channel *incoming_channel,
709 struct hv_device *device,
710 const struct vmpacket_descriptor *desc,
711 int budget)
712{
713 struct nvsp_message *nvsp_packet = hv_pkt_data(desc);
714 struct net_device *ndev = hv_get_drvdata(device);
715
716 switch (nvsp_packet->hdr.msg_type) {
717 case NVSP_MSG_TYPE_INIT_COMPLETE:
718 case NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE:
719 case NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE:
720 case NVSP_MSG5_TYPE_SUBCHANNEL:
721 /* Copy the response back */
722 memcpy(&net_device->channel_init_pkt, nvsp_packet,
723 sizeof(struct nvsp_message));
724 complete(&net_device->channel_init_wait);
725 break;
726
727 case NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE:
728 netvsc_send_tx_complete(net_device, incoming_channel,
729 device, desc, budget);
730 break;
731
732 default:
733 netdev_err(ndev,
734 "Unknown send completion type %d received!!\n",
735 nvsp_packet->hdr.msg_type);
736 }
737}
738
739static u32 netvsc_get_next_send_section(struct netvsc_device *net_device)
740{
741 unsigned long *map_addr = net_device->send_section_map;
742 unsigned int i;
743
744 for_each_clear_bit(i, map_addr, net_device->send_section_cnt) {
745 if (sync_test_and_set_bit(i, map_addr) == 0)
746 return i;
747 }
748
749 return NETVSC_INVALID_INDEX;
750}
751
752static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
753 unsigned int section_index,
754 u32 pend_size,
755 struct hv_netvsc_packet *packet,
756 struct rndis_message *rndis_msg,
757 struct hv_page_buffer *pb,
758 bool xmit_more)
759{
760 char *start = net_device->send_buf;
761 char *dest = start + (section_index * net_device->send_section_size)
762 + pend_size;
763 int i;
764 u32 padding = 0;
765 u32 page_count = packet->cp_partial ? packet->rmsg_pgcnt :
766 packet->page_buf_cnt;
767 u32 remain;
768
769 /* Add padding */
770 remain = packet->total_data_buflen & (net_device->pkt_align - 1);
771 if (xmit_more && remain) {
772 padding = net_device->pkt_align - remain;
773 rndis_msg->msg_len += padding;
774 packet->total_data_buflen += padding;
775 }
776
777 for (i = 0; i < page_count; i++) {
778 char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT);
779 u32 offset = pb[i].offset;
780 u32 len = pb[i].len;
781
782 memcpy(dest, (src + offset), len);
783 dest += len;
784 }
785
786 if (padding)
787 memset(dest, 0, padding);
788}
789
790static inline int netvsc_send_pkt(
791 struct hv_device *device,
792 struct hv_netvsc_packet *packet,
793 struct netvsc_device *net_device,
794 struct hv_page_buffer *pb,
795 struct sk_buff *skb)
796{
797 struct nvsp_message nvmsg;
798 struct nvsp_1_message_send_rndis_packet *rpkt =
799 &nvmsg.msg.v1_msg.send_rndis_pkt;
800 struct netvsc_channel * const nvchan =
801 &net_device->chan_table[packet->q_idx];
802 struct vmbus_channel *out_channel = nvchan->channel;
803 struct net_device *ndev = hv_get_drvdata(device);
804 struct net_device_context *ndev_ctx = netdev_priv(ndev);
805 struct netdev_queue *txq = netdev_get_tx_queue(ndev, packet->q_idx);
806 u64 req_id;
807 int ret;
808 u32 ring_avail = hv_ringbuf_avail_percent(&out_channel->outbound);
809
810 nvmsg.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
811 if (skb)
812 rpkt->channel_type = 0; /* 0 is RMC_DATA */
813 else
814 rpkt->channel_type = 1; /* 1 is RMC_CONTROL */
815
816 rpkt->send_buf_section_index = packet->send_buf_index;
817 if (packet->send_buf_index == NETVSC_INVALID_INDEX)
818 rpkt->send_buf_section_size = 0;
819 else
820 rpkt->send_buf_section_size = packet->total_data_buflen;
821
822 req_id = (ulong)skb;
823
824 if (out_channel->rescind)
825 return -ENODEV;
826
827 trace_nvsp_send_pkt(ndev, out_channel, rpkt);
828
829 if (packet->page_buf_cnt) {
830 if (packet->cp_partial)
831 pb += packet->rmsg_pgcnt;
832
833 ret = vmbus_sendpacket_pagebuffer(out_channel,
834 pb, packet->page_buf_cnt,
835 &nvmsg, sizeof(nvmsg),
836 req_id);
837 } else {
838 ret = vmbus_sendpacket(out_channel,
839 &nvmsg, sizeof(nvmsg),
840 req_id, VM_PKT_DATA_INBAND,
841 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
842 }
843
844 if (ret == 0) {
845 atomic_inc_return(&nvchan->queue_sends);
846
847 if (ring_avail < RING_AVAIL_PERCENT_LOWATER) {
848 netif_tx_stop_queue(txq);
849 ndev_ctx->eth_stats.stop_queue++;
850 }
851 } else if (ret == -EAGAIN) {
852 netif_tx_stop_queue(txq);
853 ndev_ctx->eth_stats.stop_queue++;
854 if (atomic_read(&nvchan->queue_sends) < 1) {
855 netif_tx_wake_queue(txq);
856 ndev_ctx->eth_stats.wake_queue++;
857 ret = -ENOSPC;
858 }
859 } else {
860 netdev_err(ndev,
861 "Unable to send packet pages %u len %u, ret %d\n",
862 packet->page_buf_cnt, packet->total_data_buflen,
863 ret);
864 }
865
866 return ret;
867}
868
869/* Move packet out of multi send data (msd), and clear msd */
870static inline void move_pkt_msd(struct hv_netvsc_packet **msd_send,
871 struct sk_buff **msd_skb,
872 struct multi_send_data *msdp)
873{
874 *msd_skb = msdp->skb;
875 *msd_send = msdp->pkt;
876 msdp->skb = NULL;
877 msdp->pkt = NULL;
878 msdp->count = 0;
879}
880
881/* RCU already held by caller */
882int netvsc_send(struct net_device *ndev,
883 struct hv_netvsc_packet *packet,
884 struct rndis_message *rndis_msg,
885 struct hv_page_buffer *pb,
886 struct sk_buff *skb)
887{
888 struct net_device_context *ndev_ctx = netdev_priv(ndev);
889 struct netvsc_device *net_device
890 = rcu_dereference_bh(ndev_ctx->nvdev);
891 struct hv_device *device = ndev_ctx->device_ctx;
892 int ret = 0;
893 struct netvsc_channel *nvchan;
894 u32 pktlen = packet->total_data_buflen, msd_len = 0;
895 unsigned int section_index = NETVSC_INVALID_INDEX;
896 struct multi_send_data *msdp;
897 struct hv_netvsc_packet *msd_send = NULL, *cur_send = NULL;
898 struct sk_buff *msd_skb = NULL;
899 bool try_batch, xmit_more;
900
901 /* If device is rescinded, return error and packet will get dropped. */
902 if (unlikely(!net_device || net_device->destroy))
903 return -ENODEV;
904
905 nvchan = &net_device->chan_table[packet->q_idx];
906 packet->send_buf_index = NETVSC_INVALID_INDEX;
907 packet->cp_partial = false;
908
909 /* Send control message directly without accessing msd (Multi-Send
910 * Data) field which may be changed during data packet processing.
911 */
912 if (!skb)
913 return netvsc_send_pkt(device, packet, net_device, pb, skb);
914
915 /* batch packets in send buffer if possible */
916 msdp = &nvchan->msd;
917 if (msdp->pkt)
918 msd_len = msdp->pkt->total_data_buflen;
919
920 try_batch = msd_len > 0 && msdp->count < net_device->max_pkt;
921 if (try_batch && msd_len + pktlen + net_device->pkt_align <
922 net_device->send_section_size) {
923 section_index = msdp->pkt->send_buf_index;
924
925 } else if (try_batch && msd_len + packet->rmsg_size <
926 net_device->send_section_size) {
927 section_index = msdp->pkt->send_buf_index;
928 packet->cp_partial = true;
929
930 } else if (pktlen + net_device->pkt_align <
931 net_device->send_section_size) {
932 section_index = netvsc_get_next_send_section(net_device);
933 if (unlikely(section_index == NETVSC_INVALID_INDEX)) {
934 ++ndev_ctx->eth_stats.tx_send_full;
935 } else {
936 move_pkt_msd(&msd_send, &msd_skb, msdp);
937 msd_len = 0;
938 }
939 }
940
941 /* Keep aggregating only if stack says more data is coming
942 * and not doing mixed modes send and not flow blocked
943 */
944 xmit_more = skb->xmit_more &&
945 !packet->cp_partial &&
946 !netif_xmit_stopped(netdev_get_tx_queue(ndev, packet->q_idx));
947
948 if (section_index != NETVSC_INVALID_INDEX) {
949 netvsc_copy_to_send_buf(net_device,
950 section_index, msd_len,
951 packet, rndis_msg, pb, xmit_more);
952
953 packet->send_buf_index = section_index;
954
955 if (packet->cp_partial) {
956 packet->page_buf_cnt -= packet->rmsg_pgcnt;
957 packet->total_data_buflen = msd_len + packet->rmsg_size;
958 } else {
959 packet->page_buf_cnt = 0;
960 packet->total_data_buflen += msd_len;
961 }
962
963 if (msdp->pkt) {
964 packet->total_packets += msdp->pkt->total_packets;
965 packet->total_bytes += msdp->pkt->total_bytes;
966 }
967
968 if (msdp->skb)
969 dev_consume_skb_any(msdp->skb);
970
971 if (xmit_more) {
972 msdp->skb = skb;
973 msdp->pkt = packet;
974 msdp->count++;
975 } else {
976 cur_send = packet;
977 msdp->skb = NULL;
978 msdp->pkt = NULL;
979 msdp->count = 0;
980 }
981 } else {
982 move_pkt_msd(&msd_send, &msd_skb, msdp);
983 cur_send = packet;
984 }
985
986 if (msd_send) {
987 int m_ret = netvsc_send_pkt(device, msd_send, net_device,
988 NULL, msd_skb);
989
990 if (m_ret != 0) {
991 netvsc_free_send_slot(net_device,
992 msd_send->send_buf_index);
993 dev_kfree_skb_any(msd_skb);
994 }
995 }
996
997 if (cur_send)
998 ret = netvsc_send_pkt(device, cur_send, net_device, pb, skb);
999
1000 if (ret != 0 && section_index != NETVSC_INVALID_INDEX)
1001 netvsc_free_send_slot(net_device, section_index);
1002
1003 return ret;
1004}
1005
1006/* Send pending recv completions */
1007static int send_recv_completions(struct net_device *ndev,
1008 struct netvsc_device *nvdev,
1009 struct netvsc_channel *nvchan)
1010{
1011 struct multi_recv_comp *mrc = &nvchan->mrc;
1012 struct recv_comp_msg {
1013 struct nvsp_message_header hdr;
1014 u32 status;
1015 } __packed;
1016 struct recv_comp_msg msg = {
1017 .hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE,
1018 };
1019 int ret;
1020
1021 while (mrc->first != mrc->next) {
1022 const struct recv_comp_data *rcd
1023 = mrc->slots + mrc->first;
1024
1025 msg.status = rcd->status;
1026 ret = vmbus_sendpacket(nvchan->channel, &msg, sizeof(msg),
1027 rcd->tid, VM_PKT_COMP, 0);
1028 if (unlikely(ret)) {
1029 struct net_device_context *ndev_ctx = netdev_priv(ndev);
1030
1031 ++ndev_ctx->eth_stats.rx_comp_busy;
1032 return ret;
1033 }
1034
1035 if (++mrc->first == nvdev->recv_completion_cnt)
1036 mrc->first = 0;
1037 }
1038
1039 /* receive completion ring has been emptied */
1040 if (unlikely(nvdev->destroy))
1041 wake_up(&nvdev->wait_drain);
1042
1043 return 0;
1044}
1045
1046/* Count how many receive completions are outstanding */
1047static void recv_comp_slot_avail(const struct netvsc_device *nvdev,
1048 const struct multi_recv_comp *mrc,
1049 u32 *filled, u32 *avail)
1050{
1051 u32 count = nvdev->recv_completion_cnt;
1052
1053 if (mrc->next >= mrc->first)
1054 *filled = mrc->next - mrc->first;
1055 else
1056 *filled = (count - mrc->first) + mrc->next;
1057
1058 *avail = count - *filled - 1;
1059}
1060
1061/* Add receive complete to ring to send to host. */
1062static void enq_receive_complete(struct net_device *ndev,
1063 struct netvsc_device *nvdev, u16 q_idx,
1064 u64 tid, u32 status)
1065{
1066 struct netvsc_channel *nvchan = &nvdev->chan_table[q_idx];
1067 struct multi_recv_comp *mrc = &nvchan->mrc;
1068 struct recv_comp_data *rcd;
1069 u32 filled, avail;
1070
1071 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1072
1073 if (unlikely(filled > NAPI_POLL_WEIGHT)) {
1074 send_recv_completions(ndev, nvdev, nvchan);
1075 recv_comp_slot_avail(nvdev, mrc, &filled, &avail);
1076 }
1077
1078 if (unlikely(!avail)) {
1079 netdev_err(ndev, "Recv_comp full buf q:%hd, tid:%llx\n",
1080 q_idx, tid);
1081 return;
1082 }
1083
1084 rcd = mrc->slots + mrc->next;
1085 rcd->tid = tid;
1086 rcd->status = status;
1087
1088 if (++mrc->next == nvdev->recv_completion_cnt)
1089 mrc->next = 0;
1090}
1091
1092static int netvsc_receive(struct net_device *ndev,
1093 struct netvsc_device *net_device,
1094 struct net_device_context *net_device_ctx,
1095 struct hv_device *device,
1096 struct vmbus_channel *channel,
1097 const struct vmpacket_descriptor *desc,
1098 struct nvsp_message *nvsp)
1099{
1100 const struct vmtransfer_page_packet_header *vmxferpage_packet
1101 = container_of(desc, const struct vmtransfer_page_packet_header, d);
1102 u16 q_idx = channel->offermsg.offer.sub_channel_index;
1103 char *recv_buf = net_device->recv_buf;
1104 u32 status = NVSP_STAT_SUCCESS;
1105 int i;
1106 int count = 0;
1107
1108 /* Make sure this is a valid nvsp packet */
1109 if (unlikely(nvsp->hdr.msg_type != NVSP_MSG1_TYPE_SEND_RNDIS_PKT)) {
1110 netif_err(net_device_ctx, rx_err, ndev,
1111 "Unknown nvsp packet type received %u\n",
1112 nvsp->hdr.msg_type);
1113 return 0;
1114 }
1115
1116 if (unlikely(vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID)) {
1117 netif_err(net_device_ctx, rx_err, ndev,
1118 "Invalid xfer page set id - expecting %x got %x\n",
1119 NETVSC_RECEIVE_BUFFER_ID,
1120 vmxferpage_packet->xfer_pageset_id);
1121 return 0;
1122 }
1123
1124 count = vmxferpage_packet->range_cnt;
1125
1126 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
1127 for (i = 0; i < count; i++) {
1128 u32 offset = vmxferpage_packet->ranges[i].byte_offset;
1129 u32 buflen = vmxferpage_packet->ranges[i].byte_count;
1130 void *data;
1131 int ret;
1132
1133 if (unlikely(offset + buflen > net_device->recv_buf_size)) {
1134 status = NVSP_STAT_FAIL;
1135 netif_err(net_device_ctx, rx_err, ndev,
1136 "Packet offset:%u + len:%u too big\n",
1137 offset, buflen);
1138
1139 continue;
1140 }
1141
1142 data = recv_buf + offset;
1143
1144 trace_rndis_recv(ndev, q_idx, data);
1145
1146 /* Pass it to the upper layer */
1147 ret = rndis_filter_receive(ndev, net_device,
1148 channel, data, buflen);
1149
1150 if (unlikely(ret != NVSP_STAT_SUCCESS))
1151 status = NVSP_STAT_FAIL;
1152 }
1153
1154 enq_receive_complete(ndev, net_device, q_idx,
1155 vmxferpage_packet->d.trans_id, status);
1156
1157 return count;
1158}
1159
1160static void netvsc_send_table(struct hv_device *hdev,
1161 struct nvsp_message *nvmsg)
1162{
1163 struct net_device *ndev = hv_get_drvdata(hdev);
1164 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1165 int i;
1166 u32 count, *tab;
1167
1168 count = nvmsg->msg.v5_msg.send_table.count;
1169 if (count != VRSS_SEND_TAB_SIZE) {
1170 netdev_err(ndev, "Received wrong send-table size:%u\n", count);
1171 return;
1172 }
1173
1174 tab = (u32 *)((unsigned long)&nvmsg->msg.v5_msg.send_table +
1175 nvmsg->msg.v5_msg.send_table.offset);
1176
1177 for (i = 0; i < count; i++)
1178 net_device_ctx->tx_table[i] = tab[i];
1179}
1180
1181static void netvsc_send_vf(struct net_device_context *net_device_ctx,
1182 struct nvsp_message *nvmsg)
1183{
1184 net_device_ctx->vf_alloc = nvmsg->msg.v4_msg.vf_assoc.allocated;
1185 net_device_ctx->vf_serial = nvmsg->msg.v4_msg.vf_assoc.serial;
1186}
1187
1188static inline void netvsc_receive_inband(struct hv_device *hdev,
1189 struct net_device_context *net_device_ctx,
1190 struct nvsp_message *nvmsg)
1191{
1192 switch (nvmsg->hdr.msg_type) {
1193 case NVSP_MSG5_TYPE_SEND_INDIRECTION_TABLE:
1194 netvsc_send_table(hdev, nvmsg);
1195 break;
1196
1197 case NVSP_MSG4_TYPE_SEND_VF_ASSOCIATION:
1198 netvsc_send_vf(net_device_ctx, nvmsg);
1199 break;
1200 }
1201}
1202
1203static int netvsc_process_raw_pkt(struct hv_device *device,
1204 struct vmbus_channel *channel,
1205 struct netvsc_device *net_device,
1206 struct net_device *ndev,
1207 const struct vmpacket_descriptor *desc,
1208 int budget)
1209{
1210 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1211 struct nvsp_message *nvmsg = hv_pkt_data(desc);
1212
1213 trace_nvsp_recv(ndev, channel, nvmsg);
1214
1215 switch (desc->type) {
1216 case VM_PKT_COMP:
1217 netvsc_send_completion(net_device, channel, device,
1218 desc, budget);
1219 break;
1220
1221 case VM_PKT_DATA_USING_XFER_PAGES:
1222 return netvsc_receive(ndev, net_device, net_device_ctx,
1223 device, channel, desc, nvmsg);
1224 break;
1225
1226 case VM_PKT_DATA_INBAND:
1227 netvsc_receive_inband(device, net_device_ctx, nvmsg);
1228 break;
1229
1230 default:
1231 netdev_err(ndev, "unhandled packet type %d, tid %llx\n",
1232 desc->type, desc->trans_id);
1233 break;
1234 }
1235
1236 return 0;
1237}
1238
1239static struct hv_device *netvsc_channel_to_device(struct vmbus_channel *channel)
1240{
1241 struct vmbus_channel *primary = channel->primary_channel;
1242
1243 return primary ? primary->device_obj : channel->device_obj;
1244}
1245
1246/* Network processing softirq
1247 * Process data in incoming ring buffer from host
1248 * Stops when ring is empty or budget is met or exceeded.
1249 */
1250int netvsc_poll(struct napi_struct *napi, int budget)
1251{
1252 struct netvsc_channel *nvchan
1253 = container_of(napi, struct netvsc_channel, napi);
1254 struct netvsc_device *net_device = nvchan->net_device;
1255 struct vmbus_channel *channel = nvchan->channel;
1256 struct hv_device *device = netvsc_channel_to_device(channel);
1257 struct net_device *ndev = hv_get_drvdata(device);
1258 int work_done = 0;
1259
1260 /* If starting a new interval */
1261 if (!nvchan->desc)
1262 nvchan->desc = hv_pkt_iter_first(channel);
1263
1264 while (nvchan->desc && work_done < budget) {
1265 work_done += netvsc_process_raw_pkt(device, channel, net_device,
1266 ndev, nvchan->desc, budget);
1267 nvchan->desc = hv_pkt_iter_next(channel, nvchan->desc);
1268 }
1269
1270 /* If send of pending receive completions suceeded
1271 * and did not exhaust NAPI budget this time
1272 * and not doing busy poll
1273 * then re-enable host interrupts
1274 * and reschedule if ring is not empty.
1275 */
1276 if (send_recv_completions(ndev, net_device, nvchan) == 0 &&
1277 work_done < budget &&
1278 napi_complete_done(napi, work_done) &&
1279 hv_end_read(&channel->inbound) &&
1280 napi_schedule_prep(napi)) {
1281 hv_begin_read(&channel->inbound);
1282 __napi_schedule(napi);
1283 }
1284
1285 /* Driver may overshoot since multiple packets per descriptor */
1286 return min(work_done, budget);
1287}
1288
1289/* Call back when data is available in host ring buffer.
1290 * Processing is deferred until network softirq (NAPI)
1291 */
1292void netvsc_channel_cb(void *context)
1293{
1294 struct netvsc_channel *nvchan = context;
1295 struct vmbus_channel *channel = nvchan->channel;
1296 struct hv_ring_buffer_info *rbi = &channel->inbound;
1297
1298 /* preload first vmpacket descriptor */
1299 prefetch(hv_get_ring_buffer(rbi) + rbi->priv_read_index);
1300
1301 if (napi_schedule_prep(&nvchan->napi)) {
1302 /* disable interupts from host */
1303 hv_begin_read(rbi);
1304
1305 __napi_schedule_irqoff(&nvchan->napi);
1306 }
1307}
1308
1309/*
1310 * netvsc_device_add - Callback when the device belonging to this
1311 * driver is added
1312 */
1313struct netvsc_device *netvsc_device_add(struct hv_device *device,
1314 const struct netvsc_device_info *device_info)
1315{
1316 int i, ret = 0;
1317 struct netvsc_device *net_device;
1318 struct net_device *ndev = hv_get_drvdata(device);
1319 struct net_device_context *net_device_ctx = netdev_priv(ndev);
1320
1321 net_device = alloc_net_device();
1322 if (!net_device)
1323 return ERR_PTR(-ENOMEM);
1324
1325 for (i = 0; i < VRSS_SEND_TAB_SIZE; i++)
1326 net_device_ctx->tx_table[i] = 0;
1327
1328 /* Because the device uses NAPI, all the interrupt batching and
1329 * control is done via Net softirq, not the channel handling
1330 */
1331 set_channel_read_mode(device->channel, HV_CALL_ISR);
1332
1333 /* If we're reopening the device we may have multiple queues, fill the
1334 * chn_table with the default channel to use it before subchannels are
1335 * opened.
1336 * Initialize the channel state before we open;
1337 * we can be interrupted as soon as we open the channel.
1338 */
1339
1340 for (i = 0; i < VRSS_CHANNEL_MAX; i++) {
1341 struct netvsc_channel *nvchan = &net_device->chan_table[i];
1342
1343 nvchan->channel = device->channel;
1344 nvchan->net_device = net_device;
1345 u64_stats_init(&nvchan->tx_stats.syncp);
1346 u64_stats_init(&nvchan->rx_stats.syncp);
1347 }
1348
1349 /* Enable NAPI handler before init callbacks */
1350 netif_napi_add(ndev, &net_device->chan_table[0].napi,
1351 netvsc_poll, NAPI_POLL_WEIGHT);
1352
1353 /* Open the channel */
1354 ret = vmbus_open(device->channel, netvsc_ring_bytes,
1355 netvsc_ring_bytes, NULL, 0,
1356 netvsc_channel_cb, net_device->chan_table);
1357
1358 if (ret != 0) {
1359 netdev_err(ndev, "unable to open channel: %d\n", ret);
1360 goto cleanup;
1361 }
1362
1363 /* Channel is opened */
1364 netdev_dbg(ndev, "hv_netvsc channel opened successfully\n");
1365
1366 napi_enable(&net_device->chan_table[0].napi);
1367
1368 /* Connect with the NetVsp */
1369 ret = netvsc_connect_vsp(device, net_device, device_info);
1370 if (ret != 0) {
1371 netdev_err(ndev,
1372 "unable to connect to NetVSP - %d\n", ret);
1373 goto close;
1374 }
1375
1376 /* Writing nvdev pointer unlocks netvsc_send(), make sure chn_table is
1377 * populated.
1378 */
1379 rcu_assign_pointer(net_device_ctx->nvdev, net_device);
1380
1381 return net_device;
1382
1383close:
1384 RCU_INIT_POINTER(net_device_ctx->nvdev, NULL);
1385 napi_disable(&net_device->chan_table[0].napi);
1386
1387 /* Now, we can close the channel safely */
1388 vmbus_close(device->channel);
1389
1390cleanup:
1391 netif_napi_del(&net_device->chan_table[0].napi);
1392 free_netvsc_device(&net_device->rcu);
1393
1394 return ERR_PTR(ret);
1395}
1/*
2 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
20 */
21#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
23#include <linux/kernel.h>
24#include <linux/sched.h>
25#include <linux/wait.h>
26#include <linux/mm.h>
27#include <linux/delay.h>
28#include <linux/io.h>
29#include <linux/slab.h>
30#include <linux/netdevice.h>
31#include <linux/if_ether.h>
32
33#include "hyperv_net.h"
34
35
36static struct netvsc_device *alloc_net_device(struct hv_device *device)
37{
38 struct netvsc_device *net_device;
39 struct net_device *ndev = hv_get_drvdata(device);
40
41 net_device = kzalloc(sizeof(struct netvsc_device), GFP_KERNEL);
42 if (!net_device)
43 return NULL;
44
45 init_waitqueue_head(&net_device->wait_drain);
46 net_device->start_remove = false;
47 net_device->destroy = false;
48 net_device->dev = device;
49 net_device->ndev = ndev;
50
51 hv_set_drvdata(device, net_device);
52 return net_device;
53}
54
55static struct netvsc_device *get_outbound_net_device(struct hv_device *device)
56{
57 struct netvsc_device *net_device;
58
59 net_device = hv_get_drvdata(device);
60 if (net_device && net_device->destroy)
61 net_device = NULL;
62
63 return net_device;
64}
65
66static struct netvsc_device *get_inbound_net_device(struct hv_device *device)
67{
68 struct netvsc_device *net_device;
69
70 net_device = hv_get_drvdata(device);
71
72 if (!net_device)
73 goto get_in_err;
74
75 if (net_device->destroy &&
76 atomic_read(&net_device->num_outstanding_sends) == 0)
77 net_device = NULL;
78
79get_in_err:
80 return net_device;
81}
82
83
84static int netvsc_destroy_recv_buf(struct netvsc_device *net_device)
85{
86 struct nvsp_message *revoke_packet;
87 int ret = 0;
88 struct net_device *ndev = net_device->ndev;
89
90 /*
91 * If we got a section count, it means we received a
92 * SendReceiveBufferComplete msg (ie sent
93 * NvspMessage1TypeSendReceiveBuffer msg) therefore, we need
94 * to send a revoke msg here
95 */
96 if (net_device->recv_section_cnt) {
97 /* Send the revoke receive buffer */
98 revoke_packet = &net_device->revoke_packet;
99 memset(revoke_packet, 0, sizeof(struct nvsp_message));
100
101 revoke_packet->hdr.msg_type =
102 NVSP_MSG1_TYPE_REVOKE_RECV_BUF;
103 revoke_packet->msg.v1_msg.
104 revoke_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
105
106 ret = vmbus_sendpacket(net_device->dev->channel,
107 revoke_packet,
108 sizeof(struct nvsp_message),
109 (unsigned long)revoke_packet,
110 VM_PKT_DATA_INBAND, 0);
111 /*
112 * If we failed here, we might as well return and
113 * have a leak rather than continue and a bugchk
114 */
115 if (ret != 0) {
116 netdev_err(ndev, "unable to send "
117 "revoke receive buffer to netvsp\n");
118 return ret;
119 }
120 }
121
122 /* Teardown the gpadl on the vsp end */
123 if (net_device->recv_buf_gpadl_handle) {
124 ret = vmbus_teardown_gpadl(net_device->dev->channel,
125 net_device->recv_buf_gpadl_handle);
126
127 /* If we failed here, we might as well return and have a leak
128 * rather than continue and a bugchk
129 */
130 if (ret != 0) {
131 netdev_err(ndev,
132 "unable to teardown receive buffer's gpadl\n");
133 return ret;
134 }
135 net_device->recv_buf_gpadl_handle = 0;
136 }
137
138 if (net_device->recv_buf) {
139 /* Free up the receive buffer */
140 free_pages((unsigned long)net_device->recv_buf,
141 get_order(net_device->recv_buf_size));
142 net_device->recv_buf = NULL;
143 }
144
145 if (net_device->recv_section) {
146 net_device->recv_section_cnt = 0;
147 kfree(net_device->recv_section);
148 net_device->recv_section = NULL;
149 }
150
151 return ret;
152}
153
154static int netvsc_init_recv_buf(struct hv_device *device)
155{
156 int ret = 0;
157 int t;
158 struct netvsc_device *net_device;
159 struct nvsp_message *init_packet;
160 struct net_device *ndev;
161
162 net_device = get_outbound_net_device(device);
163 if (!net_device)
164 return -ENODEV;
165 ndev = net_device->ndev;
166
167 net_device->recv_buf =
168 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
169 get_order(net_device->recv_buf_size));
170 if (!net_device->recv_buf) {
171 netdev_err(ndev, "unable to allocate receive "
172 "buffer of size %d\n", net_device->recv_buf_size);
173 ret = -ENOMEM;
174 goto cleanup;
175 }
176
177 /*
178 * Establish the gpadl handle for this buffer on this
179 * channel. Note: This call uses the vmbus connection rather
180 * than the channel to establish the gpadl handle.
181 */
182 ret = vmbus_establish_gpadl(device->channel, net_device->recv_buf,
183 net_device->recv_buf_size,
184 &net_device->recv_buf_gpadl_handle);
185 if (ret != 0) {
186 netdev_err(ndev,
187 "unable to establish receive buffer's gpadl\n");
188 goto cleanup;
189 }
190
191
192 /* Notify the NetVsp of the gpadl handle */
193 init_packet = &net_device->channel_init_pkt;
194
195 memset(init_packet, 0, sizeof(struct nvsp_message));
196
197 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_RECV_BUF;
198 init_packet->msg.v1_msg.send_recv_buf.
199 gpadl_handle = net_device->recv_buf_gpadl_handle;
200 init_packet->msg.v1_msg.
201 send_recv_buf.id = NETVSC_RECEIVE_BUFFER_ID;
202
203 /* Send the gpadl notification request */
204 ret = vmbus_sendpacket(device->channel, init_packet,
205 sizeof(struct nvsp_message),
206 (unsigned long)init_packet,
207 VM_PKT_DATA_INBAND,
208 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
209 if (ret != 0) {
210 netdev_err(ndev,
211 "unable to send receive buffer's gpadl to netvsp\n");
212 goto cleanup;
213 }
214
215 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
216 BUG_ON(t == 0);
217
218
219 /* Check the response */
220 if (init_packet->msg.v1_msg.
221 send_recv_buf_complete.status != NVSP_STAT_SUCCESS) {
222 netdev_err(ndev, "Unable to complete receive buffer "
223 "initialization with NetVsp - status %d\n",
224 init_packet->msg.v1_msg.
225 send_recv_buf_complete.status);
226 ret = -EINVAL;
227 goto cleanup;
228 }
229
230 /* Parse the response */
231
232 net_device->recv_section_cnt = init_packet->msg.
233 v1_msg.send_recv_buf_complete.num_sections;
234
235 net_device->recv_section = kmemdup(
236 init_packet->msg.v1_msg.send_recv_buf_complete.sections,
237 net_device->recv_section_cnt *
238 sizeof(struct nvsp_1_receive_buffer_section),
239 GFP_KERNEL);
240 if (net_device->recv_section == NULL) {
241 ret = -EINVAL;
242 goto cleanup;
243 }
244
245 /*
246 * For 1st release, there should only be 1 section that represents the
247 * entire receive buffer
248 */
249 if (net_device->recv_section_cnt != 1 ||
250 net_device->recv_section->offset != 0) {
251 ret = -EINVAL;
252 goto cleanup;
253 }
254
255 goto exit;
256
257cleanup:
258 netvsc_destroy_recv_buf(net_device);
259
260exit:
261 return ret;
262}
263
264
265/* Negotiate NVSP protocol version */
266static int negotiate_nvsp_ver(struct hv_device *device,
267 struct netvsc_device *net_device,
268 struct nvsp_message *init_packet,
269 u32 nvsp_ver)
270{
271 int ret, t;
272
273 memset(init_packet, 0, sizeof(struct nvsp_message));
274 init_packet->hdr.msg_type = NVSP_MSG_TYPE_INIT;
275 init_packet->msg.init_msg.init.min_protocol_ver = nvsp_ver;
276 init_packet->msg.init_msg.init.max_protocol_ver = nvsp_ver;
277
278 /* Send the init request */
279 ret = vmbus_sendpacket(device->channel, init_packet,
280 sizeof(struct nvsp_message),
281 (unsigned long)init_packet,
282 VM_PKT_DATA_INBAND,
283 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
284
285 if (ret != 0)
286 return ret;
287
288 t = wait_for_completion_timeout(&net_device->channel_init_wait, 5*HZ);
289
290 if (t == 0)
291 return -ETIMEDOUT;
292
293 if (init_packet->msg.init_msg.init_complete.status !=
294 NVSP_STAT_SUCCESS)
295 return -EINVAL;
296
297 if (nvsp_ver != NVSP_PROTOCOL_VERSION_2)
298 return 0;
299
300 /* NVSPv2 only: Send NDIS config */
301 memset(init_packet, 0, sizeof(struct nvsp_message));
302 init_packet->hdr.msg_type = NVSP_MSG2_TYPE_SEND_NDIS_CONFIG;
303 init_packet->msg.v2_msg.send_ndis_config.mtu = net_device->ndev->mtu;
304 init_packet->msg.v2_msg.send_ndis_config.capability.ieee8021q = 1;
305
306 ret = vmbus_sendpacket(device->channel, init_packet,
307 sizeof(struct nvsp_message),
308 (unsigned long)init_packet,
309 VM_PKT_DATA_INBAND, 0);
310
311 return ret;
312}
313
314static int netvsc_connect_vsp(struct hv_device *device)
315{
316 int ret;
317 struct netvsc_device *net_device;
318 struct nvsp_message *init_packet;
319 int ndis_version;
320 struct net_device *ndev;
321
322 net_device = get_outbound_net_device(device);
323 if (!net_device)
324 return -ENODEV;
325 ndev = net_device->ndev;
326
327 init_packet = &net_device->channel_init_pkt;
328
329 /* Negotiate the latest NVSP protocol supported */
330 if (negotiate_nvsp_ver(device, net_device, init_packet,
331 NVSP_PROTOCOL_VERSION_2) == 0) {
332 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_2;
333 } else if (negotiate_nvsp_ver(device, net_device, init_packet,
334 NVSP_PROTOCOL_VERSION_1) == 0) {
335 net_device->nvsp_version = NVSP_PROTOCOL_VERSION_1;
336 } else {
337 ret = -EPROTO;
338 goto cleanup;
339 }
340
341 pr_debug("Negotiated NVSP version:%x\n", net_device->nvsp_version);
342
343 /* Send the ndis version */
344 memset(init_packet, 0, sizeof(struct nvsp_message));
345
346 ndis_version = 0x00050001;
347
348 init_packet->hdr.msg_type = NVSP_MSG1_TYPE_SEND_NDIS_VER;
349 init_packet->msg.v1_msg.
350 send_ndis_ver.ndis_major_ver =
351 (ndis_version & 0xFFFF0000) >> 16;
352 init_packet->msg.v1_msg.
353 send_ndis_ver.ndis_minor_ver =
354 ndis_version & 0xFFFF;
355
356 /* Send the init request */
357 ret = vmbus_sendpacket(device->channel, init_packet,
358 sizeof(struct nvsp_message),
359 (unsigned long)init_packet,
360 VM_PKT_DATA_INBAND, 0);
361 if (ret != 0)
362 goto cleanup;
363
364 /* Post the big receive buffer to NetVSP */
365 ret = netvsc_init_recv_buf(device);
366
367cleanup:
368 return ret;
369}
370
371static void netvsc_disconnect_vsp(struct netvsc_device *net_device)
372{
373 netvsc_destroy_recv_buf(net_device);
374}
375
376/*
377 * netvsc_device_remove - Callback when the root bus device is removed
378 */
379int netvsc_device_remove(struct hv_device *device)
380{
381 struct netvsc_device *net_device;
382 struct hv_netvsc_packet *netvsc_packet, *pos;
383 unsigned long flags;
384
385 net_device = hv_get_drvdata(device);
386 spin_lock_irqsave(&device->channel->inbound_lock, flags);
387 net_device->destroy = true;
388 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
389
390 /* Wait for all send completions */
391 wait_event(net_device->wait_drain,
392 atomic_read(&net_device->num_outstanding_sends) == 0);
393
394 netvsc_disconnect_vsp(net_device);
395
396 /*
397 * Since we have already drained, we don't need to busy wait
398 * as was done in final_release_stor_device()
399 * Note that we cannot set the ext pointer to NULL until
400 * we have drained - to drain the outgoing packets, we need to
401 * allow incoming packets.
402 */
403
404 spin_lock_irqsave(&device->channel->inbound_lock, flags);
405 hv_set_drvdata(device, NULL);
406 spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
407
408 /*
409 * At this point, no one should be accessing net_device
410 * except in here
411 */
412 dev_notice(&device->device, "net device safe to remove\n");
413
414 /* Now, we can close the channel safely */
415 vmbus_close(device->channel);
416
417 /* Release all resources */
418 list_for_each_entry_safe(netvsc_packet, pos,
419 &net_device->recv_pkt_list, list_ent) {
420 list_del(&netvsc_packet->list_ent);
421 kfree(netvsc_packet);
422 }
423
424 kfree(net_device);
425 return 0;
426}
427
428
429#define RING_AVAIL_PERCENT_HIWATER 20
430#define RING_AVAIL_PERCENT_LOWATER 10
431
432/*
433 * Get the percentage of available bytes to write in the ring.
434 * The return value is in range from 0 to 100.
435 */
436static inline u32 hv_ringbuf_avail_percent(
437 struct hv_ring_buffer_info *ring_info)
438{
439 u32 avail_read, avail_write;
440
441 hv_get_ringbuffer_availbytes(ring_info, &avail_read, &avail_write);
442
443 return avail_write * 100 / ring_info->ring_datasize;
444}
445
446static void netvsc_send_completion(struct hv_device *device,
447 struct vmpacket_descriptor *packet)
448{
449 struct netvsc_device *net_device;
450 struct nvsp_message *nvsp_packet;
451 struct hv_netvsc_packet *nvsc_packet;
452 struct net_device *ndev;
453
454 net_device = get_inbound_net_device(device);
455 if (!net_device)
456 return;
457 ndev = net_device->ndev;
458
459 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
460 (packet->offset8 << 3));
461
462 if ((nvsp_packet->hdr.msg_type == NVSP_MSG_TYPE_INIT_COMPLETE) ||
463 (nvsp_packet->hdr.msg_type ==
464 NVSP_MSG1_TYPE_SEND_RECV_BUF_COMPLETE) ||
465 (nvsp_packet->hdr.msg_type ==
466 NVSP_MSG1_TYPE_SEND_SEND_BUF_COMPLETE)) {
467 /* Copy the response back */
468 memcpy(&net_device->channel_init_pkt, nvsp_packet,
469 sizeof(struct nvsp_message));
470 complete(&net_device->channel_init_wait);
471 } else if (nvsp_packet->hdr.msg_type ==
472 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE) {
473 int num_outstanding_sends;
474
475 /* Get the send context */
476 nvsc_packet = (struct hv_netvsc_packet *)(unsigned long)
477 packet->trans_id;
478
479 /* Notify the layer above us */
480 nvsc_packet->completion.send.send_completion(
481 nvsc_packet->completion.send.send_completion_ctx);
482
483 num_outstanding_sends =
484 atomic_dec_return(&net_device->num_outstanding_sends);
485
486 if (net_device->destroy && num_outstanding_sends == 0)
487 wake_up(&net_device->wait_drain);
488
489 if (netif_queue_stopped(ndev) && !net_device->start_remove &&
490 (hv_ringbuf_avail_percent(&device->channel->outbound)
491 > RING_AVAIL_PERCENT_HIWATER ||
492 num_outstanding_sends < 1))
493 netif_wake_queue(ndev);
494 } else {
495 netdev_err(ndev, "Unknown send completion packet type- "
496 "%d received!!\n", nvsp_packet->hdr.msg_type);
497 }
498
499}
500
501int netvsc_send(struct hv_device *device,
502 struct hv_netvsc_packet *packet)
503{
504 struct netvsc_device *net_device;
505 int ret = 0;
506 struct nvsp_message sendMessage;
507 struct net_device *ndev;
508
509 net_device = get_outbound_net_device(device);
510 if (!net_device)
511 return -ENODEV;
512 ndev = net_device->ndev;
513
514 sendMessage.hdr.msg_type = NVSP_MSG1_TYPE_SEND_RNDIS_PKT;
515 if (packet->is_data_pkt) {
516 /* 0 is RMC_DATA; */
517 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 0;
518 } else {
519 /* 1 is RMC_CONTROL; */
520 sendMessage.msg.v1_msg.send_rndis_pkt.channel_type = 1;
521 }
522
523 /* Not using send buffer section */
524 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_index =
525 0xFFFFFFFF;
526 sendMessage.msg.v1_msg.send_rndis_pkt.send_buf_section_size = 0;
527
528 if (packet->page_buf_cnt) {
529 ret = vmbus_sendpacket_pagebuffer(device->channel,
530 packet->page_buf,
531 packet->page_buf_cnt,
532 &sendMessage,
533 sizeof(struct nvsp_message),
534 (unsigned long)packet);
535 } else {
536 ret = vmbus_sendpacket(device->channel, &sendMessage,
537 sizeof(struct nvsp_message),
538 (unsigned long)packet,
539 VM_PKT_DATA_INBAND,
540 VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED);
541
542 }
543
544 if (ret == 0) {
545 atomic_inc(&net_device->num_outstanding_sends);
546 if (hv_ringbuf_avail_percent(&device->channel->outbound) <
547 RING_AVAIL_PERCENT_LOWATER) {
548 netif_stop_queue(ndev);
549 if (atomic_read(&net_device->
550 num_outstanding_sends) < 1)
551 netif_wake_queue(ndev);
552 }
553 } else if (ret == -EAGAIN) {
554 netif_stop_queue(ndev);
555 if (atomic_read(&net_device->num_outstanding_sends) < 1) {
556 netif_wake_queue(ndev);
557 ret = -ENOSPC;
558 }
559 } else {
560 netdev_err(ndev, "Unable to send packet %p ret %d\n",
561 packet, ret);
562 }
563
564 return ret;
565}
566
567static void netvsc_send_recv_completion(struct hv_device *device,
568 u64 transaction_id)
569{
570 struct nvsp_message recvcompMessage;
571 int retries = 0;
572 int ret;
573 struct net_device *ndev;
574 struct netvsc_device *net_device = hv_get_drvdata(device);
575
576 ndev = net_device->ndev;
577
578 recvcompMessage.hdr.msg_type =
579 NVSP_MSG1_TYPE_SEND_RNDIS_PKT_COMPLETE;
580
581 /* FIXME: Pass in the status */
582 recvcompMessage.msg.v1_msg.send_rndis_pkt_complete.status =
583 NVSP_STAT_SUCCESS;
584
585retry_send_cmplt:
586 /* Send the completion */
587 ret = vmbus_sendpacket(device->channel, &recvcompMessage,
588 sizeof(struct nvsp_message), transaction_id,
589 VM_PKT_COMP, 0);
590 if (ret == 0) {
591 /* success */
592 /* no-op */
593 } else if (ret == -EAGAIN) {
594 /* no more room...wait a bit and attempt to retry 3 times */
595 retries++;
596 netdev_err(ndev, "unable to send receive completion pkt"
597 " (tid %llx)...retrying %d\n", transaction_id, retries);
598
599 if (retries < 4) {
600 udelay(100);
601 goto retry_send_cmplt;
602 } else {
603 netdev_err(ndev, "unable to send receive "
604 "completion pkt (tid %llx)...give up retrying\n",
605 transaction_id);
606 }
607 } else {
608 netdev_err(ndev, "unable to send receive "
609 "completion pkt - %llx\n", transaction_id);
610 }
611}
612
613/* Send a receive completion packet to RNDIS device (ie NetVsp) */
614static void netvsc_receive_completion(void *context)
615{
616 struct hv_netvsc_packet *packet = context;
617 struct hv_device *device = (struct hv_device *)packet->device;
618 struct netvsc_device *net_device;
619 u64 transaction_id = 0;
620 bool fsend_receive_comp = false;
621 unsigned long flags;
622 struct net_device *ndev;
623
624 /*
625 * Even though it seems logical to do a GetOutboundNetDevice() here to
626 * send out receive completion, we are using GetInboundNetDevice()
627 * since we may have disable outbound traffic already.
628 */
629 net_device = get_inbound_net_device(device);
630 if (!net_device)
631 return;
632 ndev = net_device->ndev;
633
634 /* Overloading use of the lock. */
635 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
636
637 packet->xfer_page_pkt->count--;
638
639 /*
640 * Last one in the line that represent 1 xfer page packet.
641 * Return the xfer page packet itself to the freelist
642 */
643 if (packet->xfer_page_pkt->count == 0) {
644 fsend_receive_comp = true;
645 transaction_id = packet->completion.recv.recv_completion_tid;
646 list_add_tail(&packet->xfer_page_pkt->list_ent,
647 &net_device->recv_pkt_list);
648
649 }
650
651 /* Put the packet back */
652 list_add_tail(&packet->list_ent, &net_device->recv_pkt_list);
653 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
654
655 /* Send a receive completion for the xfer page packet */
656 if (fsend_receive_comp)
657 netvsc_send_recv_completion(device, transaction_id);
658
659}
660
661static void netvsc_receive(struct hv_device *device,
662 struct vmpacket_descriptor *packet)
663{
664 struct netvsc_device *net_device;
665 struct vmtransfer_page_packet_header *vmxferpage_packet;
666 struct nvsp_message *nvsp_packet;
667 struct hv_netvsc_packet *netvsc_packet = NULL;
668 /* struct netvsc_driver *netvscDriver; */
669 struct xferpage_packet *xferpage_packet = NULL;
670 int i;
671 int count = 0;
672 unsigned long flags;
673 struct net_device *ndev;
674
675 LIST_HEAD(listHead);
676
677 net_device = get_inbound_net_device(device);
678 if (!net_device)
679 return;
680 ndev = net_device->ndev;
681
682 /*
683 * All inbound packets other than send completion should be xfer page
684 * packet
685 */
686 if (packet->type != VM_PKT_DATA_USING_XFER_PAGES) {
687 netdev_err(ndev, "Unknown packet type received - %d\n",
688 packet->type);
689 return;
690 }
691
692 nvsp_packet = (struct nvsp_message *)((unsigned long)packet +
693 (packet->offset8 << 3));
694
695 /* Make sure this is a valid nvsp packet */
696 if (nvsp_packet->hdr.msg_type !=
697 NVSP_MSG1_TYPE_SEND_RNDIS_PKT) {
698 netdev_err(ndev, "Unknown nvsp packet type received-"
699 " %d\n", nvsp_packet->hdr.msg_type);
700 return;
701 }
702
703 vmxferpage_packet = (struct vmtransfer_page_packet_header *)packet;
704
705 if (vmxferpage_packet->xfer_pageset_id != NETVSC_RECEIVE_BUFFER_ID) {
706 netdev_err(ndev, "Invalid xfer page set id - "
707 "expecting %x got %x\n", NETVSC_RECEIVE_BUFFER_ID,
708 vmxferpage_packet->xfer_pageset_id);
709 return;
710 }
711
712 /*
713 * Grab free packets (range count + 1) to represent this xfer
714 * page packet. +1 to represent the xfer page packet itself.
715 * We grab it here so that we know exactly how many we can
716 * fulfil
717 */
718 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
719 while (!list_empty(&net_device->recv_pkt_list)) {
720 list_move_tail(net_device->recv_pkt_list.next, &listHead);
721 if (++count == vmxferpage_packet->range_cnt + 1)
722 break;
723 }
724 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock, flags);
725
726 /*
727 * We need at least 2 netvsc pkts (1 to represent the xfer
728 * page and at least 1 for the range) i.e. we can handled
729 * some of the xfer page packet ranges...
730 */
731 if (count < 2) {
732 netdev_err(ndev, "Got only %d netvsc pkt...needed "
733 "%d pkts. Dropping this xfer page packet completely!\n",
734 count, vmxferpage_packet->range_cnt + 1);
735
736 /* Return it to the freelist */
737 spin_lock_irqsave(&net_device->recv_pkt_list_lock, flags);
738 for (i = count; i != 0; i--) {
739 list_move_tail(listHead.next,
740 &net_device->recv_pkt_list);
741 }
742 spin_unlock_irqrestore(&net_device->recv_pkt_list_lock,
743 flags);
744
745 netvsc_send_recv_completion(device,
746 vmxferpage_packet->d.trans_id);
747
748 return;
749 }
750
751 /* Remove the 1st packet to represent the xfer page packet itself */
752 xferpage_packet = (struct xferpage_packet *)listHead.next;
753 list_del(&xferpage_packet->list_ent);
754
755 /* This is how much we can satisfy */
756 xferpage_packet->count = count - 1;
757
758 if (xferpage_packet->count != vmxferpage_packet->range_cnt) {
759 netdev_err(ndev, "Needed %d netvsc pkts to satisfy "
760 "this xfer page...got %d\n",
761 vmxferpage_packet->range_cnt, xferpage_packet->count);
762 }
763
764 /* Each range represents 1 RNDIS pkt that contains 1 ethernet frame */
765 for (i = 0; i < (count - 1); i++) {
766 netvsc_packet = (struct hv_netvsc_packet *)listHead.next;
767 list_del(&netvsc_packet->list_ent);
768
769 /* Initialize the netvsc packet */
770 netvsc_packet->xfer_page_pkt = xferpage_packet;
771 netvsc_packet->completion.recv.recv_completion =
772 netvsc_receive_completion;
773 netvsc_packet->completion.recv.recv_completion_ctx =
774 netvsc_packet;
775 netvsc_packet->device = device;
776 /* Save this so that we can send it back */
777 netvsc_packet->completion.recv.recv_completion_tid =
778 vmxferpage_packet->d.trans_id;
779
780 netvsc_packet->data = (void *)((unsigned long)net_device->
781 recv_buf + vmxferpage_packet->ranges[i].byte_offset);
782 netvsc_packet->total_data_buflen =
783 vmxferpage_packet->ranges[i].byte_count;
784
785 /* Pass it to the upper layer */
786 rndis_filter_receive(device, netvsc_packet);
787
788 netvsc_receive_completion(netvsc_packet->
789 completion.recv.recv_completion_ctx);
790 }
791
792}
793
794static void netvsc_channel_cb(void *context)
795{
796 int ret;
797 struct hv_device *device = context;
798 struct netvsc_device *net_device;
799 u32 bytes_recvd;
800 u64 request_id;
801 unsigned char *packet;
802 struct vmpacket_descriptor *desc;
803 unsigned char *buffer;
804 int bufferlen = NETVSC_PACKET_SIZE;
805 struct net_device *ndev;
806
807 packet = kzalloc(NETVSC_PACKET_SIZE * sizeof(unsigned char),
808 GFP_ATOMIC);
809 if (!packet)
810 return;
811 buffer = packet;
812
813 net_device = get_inbound_net_device(device);
814 if (!net_device)
815 goto out;
816 ndev = net_device->ndev;
817
818 do {
819 ret = vmbus_recvpacket_raw(device->channel, buffer, bufferlen,
820 &bytes_recvd, &request_id);
821 if (ret == 0) {
822 if (bytes_recvd > 0) {
823 desc = (struct vmpacket_descriptor *)buffer;
824 switch (desc->type) {
825 case VM_PKT_COMP:
826 netvsc_send_completion(device, desc);
827 break;
828
829 case VM_PKT_DATA_USING_XFER_PAGES:
830 netvsc_receive(device, desc);
831 break;
832
833 default:
834 netdev_err(ndev,
835 "unhandled packet type %d, "
836 "tid %llx len %d\n",
837 desc->type, request_id,
838 bytes_recvd);
839 break;
840 }
841
842 /* reset */
843 if (bufferlen > NETVSC_PACKET_SIZE) {
844 kfree(buffer);
845 buffer = packet;
846 bufferlen = NETVSC_PACKET_SIZE;
847 }
848 } else {
849 /* reset */
850 if (bufferlen > NETVSC_PACKET_SIZE) {
851 kfree(buffer);
852 buffer = packet;
853 bufferlen = NETVSC_PACKET_SIZE;
854 }
855
856 break;
857 }
858 } else if (ret == -ENOBUFS) {
859 /* Handle large packet */
860 buffer = kmalloc(bytes_recvd, GFP_ATOMIC);
861 if (buffer == NULL) {
862 /* Try again next time around */
863 netdev_err(ndev,
864 "unable to allocate buffer of size "
865 "(%d)!!\n", bytes_recvd);
866 break;
867 }
868
869 bufferlen = bytes_recvd;
870 }
871 } while (1);
872
873out:
874 kfree(buffer);
875 return;
876}
877
878/*
879 * netvsc_device_add - Callback when the device belonging to this
880 * driver is added
881 */
882int netvsc_device_add(struct hv_device *device, void *additional_info)
883{
884 int ret = 0;
885 int i;
886 int ring_size =
887 ((struct netvsc_device_info *)additional_info)->ring_size;
888 struct netvsc_device *net_device;
889 struct hv_netvsc_packet *packet, *pos;
890 struct net_device *ndev;
891
892 net_device = alloc_net_device(device);
893 if (!net_device) {
894 ret = -ENOMEM;
895 goto cleanup;
896 }
897
898 /*
899 * Coming into this function, struct net_device * is
900 * registered as the driver private data.
901 * In alloc_net_device(), we register struct netvsc_device *
902 * as the driver private data and stash away struct net_device *
903 * in struct netvsc_device *.
904 */
905 ndev = net_device->ndev;
906
907 /* Initialize the NetVSC channel extension */
908 net_device->recv_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
909 spin_lock_init(&net_device->recv_pkt_list_lock);
910
911 INIT_LIST_HEAD(&net_device->recv_pkt_list);
912
913 for (i = 0; i < NETVSC_RECEIVE_PACKETLIST_COUNT; i++) {
914 packet = kzalloc(sizeof(struct hv_netvsc_packet) +
915 (NETVSC_RECEIVE_SG_COUNT *
916 sizeof(struct hv_page_buffer)), GFP_KERNEL);
917 if (!packet)
918 break;
919
920 list_add_tail(&packet->list_ent,
921 &net_device->recv_pkt_list);
922 }
923 init_completion(&net_device->channel_init_wait);
924
925 /* Open the channel */
926 ret = vmbus_open(device->channel, ring_size * PAGE_SIZE,
927 ring_size * PAGE_SIZE, NULL, 0,
928 netvsc_channel_cb, device);
929
930 if (ret != 0) {
931 netdev_err(ndev, "unable to open channel: %d\n", ret);
932 goto cleanup;
933 }
934
935 /* Channel is opened */
936 pr_info("hv_netvsc channel opened successfully\n");
937
938 /* Connect with the NetVsp */
939 ret = netvsc_connect_vsp(device);
940 if (ret != 0) {
941 netdev_err(ndev,
942 "unable to connect to NetVSP - %d\n", ret);
943 goto close;
944 }
945
946 return ret;
947
948close:
949 /* Now, we can close the channel safely */
950 vmbus_close(device->channel);
951
952cleanup:
953
954 if (net_device) {
955 list_for_each_entry_safe(packet, pos,
956 &net_device->recv_pkt_list,
957 list_ent) {
958 list_del(&packet->list_ent);
959 kfree(packet);
960 }
961
962 kfree(net_device);
963 }
964
965 return ret;
966}