1 /*
2 * vhost-vdpa.c
3 *
4 * Copyright(c) 2017-2018 Intel Corporation.
5 * Copyright(c) 2020 Red Hat, Inc.
6 *
7 * This work is licensed under the terms of the GNU GPL, version 2 or later.
8 * See the COPYING file in the top-level directory.
9 *
10 */
11
12 #include "qemu/osdep.h"
13 #include "clients.h"
14 #include "hw/virtio/virtio-net.h"
15 #include "net/vhost_net.h"
16 #include "net/vhost-vdpa.h"
17 #include "hw/virtio/vhost-vdpa.h"
18 #include "qemu/config-file.h"
19 #include "qemu/error-report.h"
20 #include "qemu/log.h"
21 #include "qemu/memalign.h"
22 #include "qemu/option.h"
23 #include "qapi/error.h"
24 #include <linux/vhost.h>
25 #include <sys/ioctl.h>
26 #include <err.h>
27 #include "standard-headers/linux/virtio_net.h"
28 #include "monitor/monitor.h"
29 #include "migration/misc.h"
30 #include "hw/virtio/vhost.h"
31 #include "trace.h"
32
33 /* Todo:need to add the multiqueue support here */
34 typedef struct VhostVDPAState {
35 NetClientState nc;
36 struct vhost_vdpa vhost_vdpa;
37 NotifierWithReturn migration_state;
38 VHostNetState *vhost_net;
39
40 /* Control commands shadow buffers */
41 void *cvq_cmd_out_buffer;
42 virtio_net_ctrl_ack *status;
43
44 /* The device always have SVQ enabled */
45 bool always_svq;
46
47 /* The device can isolate CVQ in its own ASID */
48 bool cvq_isolated;
49
50 bool started;
51 } VhostVDPAState;
52
53 /*
54 * The array is sorted alphabetically in ascending order,
55 * with the exception of VHOST_INVALID_FEATURE_BIT,
56 * which should always be the last entry.
57 */
58 const int vdpa_feature_bits[] = {
59 VIRTIO_F_ANY_LAYOUT,
60 VIRTIO_F_IOMMU_PLATFORM,
61 VIRTIO_F_NOTIFY_ON_EMPTY,
62 VIRTIO_F_RING_PACKED,
63 VIRTIO_F_RING_RESET,
64 VIRTIO_F_VERSION_1,
65 VIRTIO_F_IN_ORDER,
66 VIRTIO_F_NOTIFICATION_DATA,
67 VIRTIO_NET_F_CSUM,
68 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS,
69 VIRTIO_NET_F_CTRL_MAC_ADDR,
70 VIRTIO_NET_F_CTRL_RX,
71 VIRTIO_NET_F_CTRL_RX_EXTRA,
72 VIRTIO_NET_F_CTRL_VLAN,
73 VIRTIO_NET_F_CTRL_VQ,
74 VIRTIO_NET_F_GSO,
75 VIRTIO_NET_F_GUEST_CSUM,
76 VIRTIO_NET_F_GUEST_ECN,
77 VIRTIO_NET_F_GUEST_TSO4,
78 VIRTIO_NET_F_GUEST_TSO6,
79 VIRTIO_NET_F_GUEST_UFO,
80 VIRTIO_NET_F_GUEST_USO4,
81 VIRTIO_NET_F_GUEST_USO6,
82 VIRTIO_NET_F_HASH_REPORT,
83 VIRTIO_NET_F_HOST_ECN,
84 VIRTIO_NET_F_HOST_TSO4,
85 VIRTIO_NET_F_HOST_TSO6,
86 VIRTIO_NET_F_HOST_UFO,
87 VIRTIO_NET_F_HOST_USO,
88 VIRTIO_NET_F_MQ,
89 VIRTIO_NET_F_MRG_RXBUF,
90 VIRTIO_NET_F_MTU,
91 VIRTIO_NET_F_RSC_EXT,
92 VIRTIO_NET_F_RSS,
93 VIRTIO_NET_F_STATUS,
94 VIRTIO_RING_F_EVENT_IDX,
95 VIRTIO_RING_F_INDIRECT_DESC,
96
97 /* VHOST_INVALID_FEATURE_BIT should always be the last entry */
98 VHOST_INVALID_FEATURE_BIT
99 };
100
101 /** Supported device specific feature bits with SVQ */
102 static const uint64_t vdpa_svq_device_features =
103 BIT_ULL(VIRTIO_NET_F_CSUM) |
104 BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) |
105 BIT_ULL(VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) |
106 BIT_ULL(VIRTIO_NET_F_MTU) |
107 BIT_ULL(VIRTIO_NET_F_MAC) |
108 BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) |
109 BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) |
110 BIT_ULL(VIRTIO_NET_F_GUEST_ECN) |
111 BIT_ULL(VIRTIO_NET_F_GUEST_UFO) |
112 BIT_ULL(VIRTIO_NET_F_HOST_TSO4) |
113 BIT_ULL(VIRTIO_NET_F_HOST_TSO6) |
114 BIT_ULL(VIRTIO_NET_F_HOST_ECN) |
115 BIT_ULL(VIRTIO_NET_F_HOST_UFO) |
116 BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) |
117 BIT_ULL(VIRTIO_NET_F_STATUS) |
118 BIT_ULL(VIRTIO_NET_F_CTRL_VQ) |
119 BIT_ULL(VIRTIO_NET_F_CTRL_RX) |
120 BIT_ULL(VIRTIO_NET_F_CTRL_VLAN) |
121 BIT_ULL(VIRTIO_NET_F_CTRL_RX_EXTRA) |
122 BIT_ULL(VIRTIO_NET_F_MQ) |
123 BIT_ULL(VIRTIO_F_ANY_LAYOUT) |
124 BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) |
125 /* VHOST_F_LOG_ALL is exposed by SVQ */
126 BIT_ULL(VHOST_F_LOG_ALL) |
127 BIT_ULL(VIRTIO_NET_F_HASH_REPORT) |
128 BIT_ULL(VIRTIO_NET_F_RSS) |
129 BIT_ULL(VIRTIO_NET_F_RSC_EXT) |
130 BIT_ULL(VIRTIO_NET_F_STANDBY) |
131 BIT_ULL(VIRTIO_NET_F_SPEED_DUPLEX);
132
133 #define VHOST_VDPA_NET_CVQ_ASID 1
134
vhost_vdpa_get_vhost_net(NetClientState * nc)135 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc)
136 {
137 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
138 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
139 return s->vhost_net;
140 }
141
vhost_vdpa_net_cvq_cmd_len(void)142 static size_t vhost_vdpa_net_cvq_cmd_len(void)
143 {
144 /*
145 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer.
146 * In buffer is always 1 byte, so it should fit here
147 */
148 return sizeof(struct virtio_net_ctrl_hdr) +
149 2 * sizeof(struct virtio_net_ctrl_mac) +
150 MAC_TABLE_ENTRIES * ETH_ALEN;
151 }
152
vhost_vdpa_net_cvq_cmd_page_len(void)153 static size_t vhost_vdpa_net_cvq_cmd_page_len(void)
154 {
155 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size());
156 }
157
vhost_vdpa_net_valid_svq_features(uint64_t features,Error ** errp)158 static bool vhost_vdpa_net_valid_svq_features(uint64_t features, Error **errp)
159 {
160 uint64_t invalid_dev_features =
161 features & ~vdpa_svq_device_features &
162 /* Transport are all accepted at this point */
163 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START,
164 VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START);
165
166 if (invalid_dev_features) {
167 error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64,
168 invalid_dev_features);
169 return false;
170 }
171
172 return vhost_svq_valid_features(features, errp);
173 }
174
vhost_vdpa_net_check_device_id(struct vhost_net * net)175 static int vhost_vdpa_net_check_device_id(struct vhost_net *net)
176 {
177 uint32_t device_id;
178 int ret;
179 struct vhost_dev *hdev;
180
181 hdev = (struct vhost_dev *)&net->dev;
182 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id);
183 if (device_id != VIRTIO_ID_NET) {
184 return -ENOTSUP;
185 }
186 return ret;
187 }
188
vhost_vdpa_add(NetClientState * ncs,void * be,int queue_pair_index,int nvqs)189 static int vhost_vdpa_add(NetClientState *ncs, void *be,
190 int queue_pair_index, int nvqs)
191 {
192 VhostNetOptions options;
193 struct vhost_net *net = NULL;
194 VhostVDPAState *s;
195 int ret;
196
197 options.backend_type = VHOST_BACKEND_TYPE_VDPA;
198 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
199 s = DO_UPCAST(VhostVDPAState, nc, ncs);
200 options.net_backend = ncs;
201 options.opaque = be;
202 options.busyloop_timeout = 0;
203 options.nvqs = nvqs;
204
205 net = vhost_net_init(&options);
206 if (!net) {
207 error_report("failed to init vhost_net for queue");
208 goto err_init;
209 }
210 s->vhost_net = net;
211 ret = vhost_vdpa_net_check_device_id(net);
212 if (ret) {
213 goto err_check;
214 }
215 return 0;
216 err_check:
217 vhost_net_cleanup(net);
218 g_free(net);
219 err_init:
220 return -1;
221 }
222
vhost_vdpa_cleanup(NetClientState * nc)223 static void vhost_vdpa_cleanup(NetClientState *nc)
224 {
225 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
226
227 /*
228 * If a peer NIC is attached, do not cleanup anything.
229 * Cleanup will happen as a part of qemu_cleanup() -> net_cleanup()
230 * when the guest is shutting down.
231 */
232 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) {
233 return;
234 }
235 munmap(s->cvq_cmd_out_buffer, vhost_vdpa_net_cvq_cmd_page_len());
236 munmap(s->status, vhost_vdpa_net_cvq_cmd_page_len());
237 if (s->vhost_net) {
238 vhost_net_cleanup(s->vhost_net);
239 g_free(s->vhost_net);
240 s->vhost_net = NULL;
241 }
242 if (s->vhost_vdpa.index != 0) {
243 return;
244 }
245 qemu_close(s->vhost_vdpa.shared->device_fd);
246 g_free(s->vhost_vdpa.shared);
247 }
248
249 /** Dummy SetSteeringEBPF to support RSS for vhost-vdpa backend */
vhost_vdpa_set_steering_ebpf(NetClientState * nc,int prog_fd)250 static bool vhost_vdpa_set_steering_ebpf(NetClientState *nc, int prog_fd)
251 {
252 return true;
253 }
254
vhost_vdpa_has_vnet_hdr(NetClientState * nc)255 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
256 {
257 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
258
259 return true;
260 }
261
vhost_vdpa_has_ufo(NetClientState * nc)262 static bool vhost_vdpa_has_ufo(NetClientState *nc)
263 {
264 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
265 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
266 uint64_t features = 0;
267 features |= (1ULL << VIRTIO_NET_F_HOST_UFO);
268 features = vhost_net_get_features(s->vhost_net, features);
269 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));
270
271 }
272
vhost_vdpa_check_peer_type(NetClientState * nc,ObjectClass * oc,Error ** errp)273 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc,
274 Error **errp)
275 {
276 const char *driver = object_class_get_name(oc);
277
278 if (!g_str_has_prefix(driver, "virtio-net-")) {
279 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
280 return false;
281 }
282
283 return true;
284 }
285
286 /** Dummy receive in case qemu falls back to userland tap networking */
vhost_vdpa_receive(NetClientState * nc,const uint8_t * buf,size_t size)287 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf,
288 size_t size)
289 {
290 return size;
291 }
292
293
294 /** From any vdpa net client, get the netclient of the i-th queue pair */
vhost_vdpa_net_get_nc_vdpa(VhostVDPAState * s,int i)295 static VhostVDPAState *vhost_vdpa_net_get_nc_vdpa(VhostVDPAState *s, int i)
296 {
297 NICState *nic = qemu_get_nic(s->nc.peer);
298 NetClientState *nc_i = qemu_get_peer(nic->ncs, i);
299
300 return DO_UPCAST(VhostVDPAState, nc, nc_i);
301 }
302
vhost_vdpa_net_first_nc_vdpa(VhostVDPAState * s)303 static VhostVDPAState *vhost_vdpa_net_first_nc_vdpa(VhostVDPAState *s)
304 {
305 return vhost_vdpa_net_get_nc_vdpa(s, 0);
306 }
307
vhost_vdpa_net_log_global_enable(VhostVDPAState * s,bool enable)308 static void vhost_vdpa_net_log_global_enable(VhostVDPAState *s, bool enable)
309 {
310 struct vhost_vdpa *v = &s->vhost_vdpa;
311 VirtIONet *n;
312 VirtIODevice *vdev;
313 int data_queue_pairs, cvq, r;
314
315 /* We are only called on the first data vqs and only if x-svq is not set */
316 if (s->vhost_vdpa.shadow_vqs_enabled == enable) {
317 return;
318 }
319
320 vdev = v->dev->vdev;
321 n = VIRTIO_NET(vdev);
322 if (!n->vhost_started) {
323 return;
324 }
325
326 data_queue_pairs = n->multiqueue ? n->max_queue_pairs : 1;
327 cvq = virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ?
328 n->max_ncs - n->max_queue_pairs : 0;
329 v->shared->svq_switching = enable ?
330 SVQ_TSTATE_ENABLING : SVQ_TSTATE_DISABLING;
331 /*
332 * TODO: vhost_net_stop does suspend, get_base and reset. We can be smarter
333 * in the future and resume the device if read-only operations between
334 * suspend and reset goes wrong.
335 */
336 vhost_net_stop(vdev, n->nic->ncs, data_queue_pairs, cvq);
337
338 /* Start will check migration setup_or_active to configure or not SVQ */
339 r = vhost_net_start(vdev, n->nic->ncs, data_queue_pairs, cvq);
340 if (unlikely(r < 0)) {
341 error_report("unable to start vhost net: %s(%d)", g_strerror(-r), -r);
342 }
343 v->shared->svq_switching = SVQ_TSTATE_DONE;
344 }
345
vdpa_net_migration_state_notifier(NotifierWithReturn * notifier,MigrationEvent * e,Error ** errp)346 static int vdpa_net_migration_state_notifier(NotifierWithReturn *notifier,
347 MigrationEvent *e, Error **errp)
348 {
349 VhostVDPAState *s = container_of(notifier, VhostVDPAState, migration_state);
350
351 if (e->type == MIG_EVENT_PRECOPY_SETUP) {
352 vhost_vdpa_net_log_global_enable(s, true);
353 } else if (e->type == MIG_EVENT_PRECOPY_FAILED) {
354 vhost_vdpa_net_log_global_enable(s, false);
355 }
356 return 0;
357 }
358
vhost_vdpa_net_data_start_first(VhostVDPAState * s)359 static void vhost_vdpa_net_data_start_first(VhostVDPAState *s)
360 {
361 struct vhost_vdpa *v = &s->vhost_vdpa;
362
363 migration_add_notifier(&s->migration_state,
364 vdpa_net_migration_state_notifier);
365 if (v->shadow_vqs_enabled) {
366 v->shared->iova_tree = vhost_iova_tree_new(v->shared->iova_range.first,
367 v->shared->iova_range.last);
368 }
369 }
370
vhost_vdpa_net_data_start(NetClientState * nc)371 static int vhost_vdpa_net_data_start(NetClientState *nc)
372 {
373 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
374 struct vhost_vdpa *v = &s->vhost_vdpa;
375
376 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
377
378 if (s->always_svq || migration_is_running()) {
379 v->shadow_vqs_enabled = true;
380 } else {
381 v->shadow_vqs_enabled = false;
382 }
383
384 if (v->index == 0) {
385 v->shared->shadow_data = v->shadow_vqs_enabled;
386 vhost_vdpa_net_data_start_first(s);
387 return 0;
388 }
389
390 return 0;
391 }
392
vhost_vdpa_net_data_load(NetClientState * nc)393 static int vhost_vdpa_net_data_load(NetClientState *nc)
394 {
395 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
396 struct vhost_vdpa *v = &s->vhost_vdpa;
397 bool has_cvq = v->dev->vq_index_end % 2;
398
399 if (has_cvq) {
400 return 0;
401 }
402
403 for (int i = 0; i < v->dev->nvqs; ++i) {
404 int ret = vhost_vdpa_set_vring_ready(v, i + v->dev->vq_index);
405 if (ret < 0) {
406 return ret;
407 }
408 }
409 return 0;
410 }
411
vhost_vdpa_net_client_stop(NetClientState * nc)412 static void vhost_vdpa_net_client_stop(NetClientState *nc)
413 {
414 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
415 struct vhost_dev *dev;
416
417 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
418
419 if (s->vhost_vdpa.index == 0) {
420 migration_remove_notifier(&s->migration_state);
421 }
422
423 dev = s->vhost_vdpa.dev;
424 if (dev->vq_index + dev->nvqs == dev->vq_index_end) {
425 g_clear_pointer(&s->vhost_vdpa.shared->iova_tree,
426 vhost_iova_tree_delete);
427 }
428 }
429
430 static NetClientInfo net_vhost_vdpa_info = {
431 .type = NET_CLIENT_DRIVER_VHOST_VDPA,
432 .size = sizeof(VhostVDPAState),
433 .receive = vhost_vdpa_receive,
434 .start = vhost_vdpa_net_data_start,
435 .load = vhost_vdpa_net_data_load,
436 .stop = vhost_vdpa_net_client_stop,
437 .cleanup = vhost_vdpa_cleanup,
438 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
439 .has_ufo = vhost_vdpa_has_ufo,
440 .check_peer_type = vhost_vdpa_check_peer_type,
441 .set_steering_ebpf = vhost_vdpa_set_steering_ebpf,
442 };
443
vhost_vdpa_get_vring_group(int device_fd,unsigned vq_index,Error ** errp)444 static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index,
445 Error **errp)
446 {
447 struct vhost_vring_state state = {
448 .index = vq_index,
449 };
450 int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, &state);
451
452 if (unlikely(r < 0)) {
453 r = -errno;
454 error_setg_errno(errp, errno, "Cannot get VQ %u group", vq_index);
455 return r;
456 }
457
458 return state.num;
459 }
460
vhost_vdpa_set_address_space_id(struct vhost_vdpa * v,unsigned vq_group,unsigned asid_num)461 static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v,
462 unsigned vq_group,
463 unsigned asid_num)
464 {
465 struct vhost_vring_state asid = {
466 .index = vq_group,
467 .num = asid_num,
468 };
469 int r;
470
471 trace_vhost_vdpa_set_address_space_id(v, vq_group, asid_num);
472
473 r = ioctl(v->shared->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid);
474 if (unlikely(r < 0)) {
475 error_report("Can't set vq group %u asid %u, errno=%d (%s)",
476 asid.index, asid.num, errno, g_strerror(errno));
477 }
478 return r;
479 }
480
vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa * v,void * addr)481 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr)
482 {
483 VhostIOVATree *tree = v->shared->iova_tree;
484 DMAMap needle = {
485 /*
486 * No need to specify size or to look for more translations since
487 * this contiguous chunk was allocated by us.
488 */
489 .translated_addr = (hwaddr)(uintptr_t)addr,
490 };
491 const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle);
492 int r;
493
494 if (unlikely(!map)) {
495 error_report("Cannot locate expected map");
496 return;
497 }
498
499 r = vhost_vdpa_dma_unmap(v->shared, v->address_space_id, map->iova,
500 map->size + 1);
501 if (unlikely(r != 0)) {
502 error_report("Device cannot unmap: %s(%d)", g_strerror(r), r);
503 }
504
505 vhost_iova_tree_remove(tree, *map);
506 }
507
508 /** Map CVQ buffer. */
vhost_vdpa_cvq_map_buf(struct vhost_vdpa * v,void * buf,size_t size,bool write)509 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size,
510 bool write)
511 {
512 DMAMap map = {};
513 int r;
514
515 map.translated_addr = (hwaddr)(uintptr_t)buf;
516 map.size = size - 1;
517 map.perm = write ? IOMMU_RW : IOMMU_RO,
518 r = vhost_iova_tree_map_alloc(v->shared->iova_tree, &map);
519 if (unlikely(r != IOVA_OK)) {
520 error_report("Cannot map injected element");
521 return r;
522 }
523
524 r = vhost_vdpa_dma_map(v->shared, v->address_space_id, map.iova,
525 vhost_vdpa_net_cvq_cmd_page_len(), buf, !write);
526 if (unlikely(r < 0)) {
527 goto dma_map_err;
528 }
529
530 return 0;
531
532 dma_map_err:
533 vhost_iova_tree_remove(v->shared->iova_tree, map);
534 return r;
535 }
536
vhost_vdpa_net_cvq_start(NetClientState * nc)537 static int vhost_vdpa_net_cvq_start(NetClientState *nc)
538 {
539 VhostVDPAState *s, *s0;
540 struct vhost_vdpa *v;
541 int64_t cvq_group;
542 int r;
543 Error *err = NULL;
544
545 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
546
547 s = DO_UPCAST(VhostVDPAState, nc, nc);
548 v = &s->vhost_vdpa;
549
550 s0 = vhost_vdpa_net_first_nc_vdpa(s);
551 v->shadow_vqs_enabled = s0->vhost_vdpa.shadow_vqs_enabled;
552 s->vhost_vdpa.address_space_id = VHOST_VDPA_GUEST_PA_ASID;
553
554 if (v->shared->shadow_data) {
555 /* SVQ is already configured for all virtqueues */
556 goto out;
557 }
558
559 /*
560 * If we early return in these cases SVQ will not be enabled. The migration
561 * will be blocked as long as vhost-vdpa backends will not offer _F_LOG.
562 */
563 if (!vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) {
564 return 0;
565 }
566
567 if (!s->cvq_isolated) {
568 return 0;
569 }
570
571 cvq_group = vhost_vdpa_get_vring_group(v->shared->device_fd,
572 v->dev->vq_index_end - 1,
573 &err);
574 if (unlikely(cvq_group < 0)) {
575 error_report_err(err);
576 return cvq_group;
577 }
578
579 r = vhost_vdpa_set_address_space_id(v, cvq_group, VHOST_VDPA_NET_CVQ_ASID);
580 if (unlikely(r < 0)) {
581 return r;
582 }
583
584 v->shadow_vqs_enabled = true;
585 s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_ASID;
586
587 out:
588 if (!s->vhost_vdpa.shadow_vqs_enabled) {
589 return 0;
590 }
591
592 /*
593 * If other vhost_vdpa already have an iova_tree, reuse it for simplicity,
594 * whether CVQ shares ASID with guest or not, because:
595 * - Memory listener need access to guest's memory addresses allocated in
596 * the IOVA tree.
597 * - There should be plenty of IOVA address space for both ASID not to
598 * worry about collisions between them. Guest's translations are still
599 * validated with virtio virtqueue_pop so there is no risk for the guest
600 * to access memory that it shouldn't.
601 *
602 * To allocate a iova tree per ASID is doable but it complicates the code
603 * and it is not worth it for the moment.
604 */
605 if (!v->shared->iova_tree) {
606 v->shared->iova_tree = vhost_iova_tree_new(v->shared->iova_range.first,
607 v->shared->iova_range.last);
608 }
609
610 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer,
611 vhost_vdpa_net_cvq_cmd_page_len(), false);
612 if (unlikely(r < 0)) {
613 return r;
614 }
615
616 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status,
617 vhost_vdpa_net_cvq_cmd_page_len(), true);
618 if (unlikely(r < 0)) {
619 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer);
620 }
621
622 return r;
623 }
624
vhost_vdpa_net_cvq_stop(NetClientState * nc)625 static void vhost_vdpa_net_cvq_stop(NetClientState *nc)
626 {
627 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
628
629 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
630
631 if (s->vhost_vdpa.shadow_vqs_enabled) {
632 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer);
633 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status);
634 }
635
636 vhost_vdpa_net_client_stop(nc);
637 }
638
vhost_vdpa_net_cvq_add(VhostVDPAState * s,const struct iovec * out_sg,size_t out_num,const struct iovec * in_sg,size_t in_num)639 static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s,
640 const struct iovec *out_sg, size_t out_num,
641 const struct iovec *in_sg, size_t in_num)
642 {
643 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0);
644 int r;
645
646 r = vhost_svq_add(svq, out_sg, out_num, in_sg, in_num, NULL);
647 if (unlikely(r != 0)) {
648 if (unlikely(r == -ENOSPC)) {
649 qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n",
650 __func__);
651 }
652 }
653
654 return r;
655 }
656
657 /*
658 * Convenience wrapper to poll SVQ for multiple control commands.
659 *
660 * Caller should hold the BQL when invoking this function, and should take
661 * the answer before SVQ pulls by itself when BQL is released.
662 */
vhost_vdpa_net_svq_poll(VhostVDPAState * s,size_t cmds_in_flight)663 static ssize_t vhost_vdpa_net_svq_poll(VhostVDPAState *s, size_t cmds_in_flight)
664 {
665 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0);
666 return vhost_svq_poll(svq, cmds_in_flight);
667 }
668
vhost_vdpa_net_load_cursor_reset(VhostVDPAState * s,struct iovec * out_cursor,struct iovec * in_cursor)669 static void vhost_vdpa_net_load_cursor_reset(VhostVDPAState *s,
670 struct iovec *out_cursor,
671 struct iovec *in_cursor)
672 {
673 /* reset the cursor of the output buffer for the device */
674 out_cursor->iov_base = s->cvq_cmd_out_buffer;
675 out_cursor->iov_len = vhost_vdpa_net_cvq_cmd_page_len();
676
677 /* reset the cursor of the in buffer for the device */
678 in_cursor->iov_base = s->status;
679 in_cursor->iov_len = vhost_vdpa_net_cvq_cmd_page_len();
680 }
681
682 /*
683 * Poll SVQ for multiple pending control commands and check the device's ack.
684 *
685 * Caller should hold the BQL when invoking this function.
686 *
687 * @s: The VhostVDPAState
688 * @len: The length of the pending status shadow buffer
689 */
vhost_vdpa_net_svq_flush(VhostVDPAState * s,size_t len)690 static ssize_t vhost_vdpa_net_svq_flush(VhostVDPAState *s, size_t len)
691 {
692 /* device uses a one-byte length ack for each control command */
693 ssize_t dev_written = vhost_vdpa_net_svq_poll(s, len);
694 if (unlikely(dev_written != len)) {
695 return -EIO;
696 }
697
698 /* check the device's ack */
699 for (int i = 0; i < len; ++i) {
700 if (s->status[i] != VIRTIO_NET_OK) {
701 return -EIO;
702 }
703 }
704 return 0;
705 }
706
vhost_vdpa_net_load_cmd(VhostVDPAState * s,struct iovec * out_cursor,struct iovec * in_cursor,uint8_t class,uint8_t cmd,const struct iovec * data_sg,size_t data_num)707 static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s,
708 struct iovec *out_cursor,
709 struct iovec *in_cursor, uint8_t class,
710 uint8_t cmd, const struct iovec *data_sg,
711 size_t data_num)
712 {
713 const struct virtio_net_ctrl_hdr ctrl = {
714 .class = class,
715 .cmd = cmd,
716 };
717 size_t data_size = iov_size(data_sg, data_num), cmd_size;
718 struct iovec out, in;
719 ssize_t r;
720 unsigned dummy_cursor_iov_cnt;
721 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0);
722
723 assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl));
724 cmd_size = sizeof(ctrl) + data_size;
725 trace_vhost_vdpa_net_load_cmd(s, class, cmd, data_num, data_size);
726 if (vhost_svq_available_slots(svq) < 2 ||
727 iov_size(out_cursor, 1) < cmd_size) {
728 /*
729 * It is time to flush all pending control commands if SVQ is full
730 * or control commands shadow buffers are full.
731 *
732 * We can poll here since we've had BQL from the time
733 * we sent the descriptor.
734 */
735 r = vhost_vdpa_net_svq_flush(s, in_cursor->iov_base -
736 (void *)s->status);
737 if (unlikely(r < 0)) {
738 return r;
739 }
740
741 vhost_vdpa_net_load_cursor_reset(s, out_cursor, in_cursor);
742 }
743
744 /* pack the CVQ command header */
745 iov_from_buf(out_cursor, 1, 0, &ctrl, sizeof(ctrl));
746 /* pack the CVQ command command-specific-data */
747 iov_to_buf(data_sg, data_num, 0,
748 out_cursor->iov_base + sizeof(ctrl), data_size);
749
750 /* extract the required buffer from the cursor for output */
751 iov_copy(&out, 1, out_cursor, 1, 0, cmd_size);
752 /* extract the required buffer from the cursor for input */
753 iov_copy(&in, 1, in_cursor, 1, 0, sizeof(*s->status));
754
755 r = vhost_vdpa_net_cvq_add(s, &out, 1, &in, 1);
756 if (unlikely(r < 0)) {
757 trace_vhost_vdpa_net_load_cmd_retval(s, class, cmd, r);
758 return r;
759 }
760
761 /* iterate the cursors */
762 dummy_cursor_iov_cnt = 1;
763 iov_discard_front(&out_cursor, &dummy_cursor_iov_cnt, cmd_size);
764 dummy_cursor_iov_cnt = 1;
765 iov_discard_front(&in_cursor, &dummy_cursor_iov_cnt, sizeof(*s->status));
766
767 return 0;
768 }
769
vhost_vdpa_net_load_mac(VhostVDPAState * s,const VirtIONet * n,struct iovec * out_cursor,struct iovec * in_cursor)770 static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n,
771 struct iovec *out_cursor,
772 struct iovec *in_cursor)
773 {
774 if (virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_MAC_ADDR)) {
775 const struct iovec data = {
776 .iov_base = (void *)n->mac,
777 .iov_len = sizeof(n->mac),
778 };
779 ssize_t r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor,
780 VIRTIO_NET_CTRL_MAC,
781 VIRTIO_NET_CTRL_MAC_ADDR_SET,
782 &data, 1);
783 if (unlikely(r < 0)) {
784 return r;
785 }
786 }
787
788 /*
789 * According to VirtIO standard, "The device MUST have an
790 * empty MAC filtering table on reset.".
791 *
792 * Therefore, there is no need to send this CVQ command if the
793 * driver also sets an empty MAC filter table, which aligns with
794 * the device's defaults.
795 *
796 * Note that the device's defaults can mismatch the driver's
797 * configuration only at live migration.
798 */
799 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_RX) ||
800 n->mac_table.in_use == 0) {
801 return 0;
802 }
803
804 uint32_t uni_entries = n->mac_table.first_multi,
805 uni_macs_size = uni_entries * ETH_ALEN,
806 mul_entries = n->mac_table.in_use - uni_entries,
807 mul_macs_size = mul_entries * ETH_ALEN;
808 struct virtio_net_ctrl_mac uni = {
809 .entries = cpu_to_le32(uni_entries),
810 };
811 struct virtio_net_ctrl_mac mul = {
812 .entries = cpu_to_le32(mul_entries),
813 };
814 const struct iovec data[] = {
815 {
816 .iov_base = &uni,
817 .iov_len = sizeof(uni),
818 }, {
819 .iov_base = n->mac_table.macs,
820 .iov_len = uni_macs_size,
821 }, {
822 .iov_base = &mul,
823 .iov_len = sizeof(mul),
824 }, {
825 .iov_base = &n->mac_table.macs[uni_macs_size],
826 .iov_len = mul_macs_size,
827 },
828 };
829 ssize_t r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor,
830 VIRTIO_NET_CTRL_MAC,
831 VIRTIO_NET_CTRL_MAC_TABLE_SET,
832 data, ARRAY_SIZE(data));
833 if (unlikely(r < 0)) {
834 return r;
835 }
836
837 return 0;
838 }
839
vhost_vdpa_net_load_rss(VhostVDPAState * s,const VirtIONet * n,struct iovec * out_cursor,struct iovec * in_cursor,bool do_rss)840 static int vhost_vdpa_net_load_rss(VhostVDPAState *s, const VirtIONet *n,
841 struct iovec *out_cursor,
842 struct iovec *in_cursor, bool do_rss)
843 {
844 struct virtio_net_rss_config cfg = {};
845 ssize_t r;
846 g_autofree uint16_t *table = NULL;
847
848 /*
849 * According to VirtIO standard, "Initially the device has all hash
850 * types disabled and reports only VIRTIO_NET_HASH_REPORT_NONE.".
851 *
852 * Therefore, there is no need to send this CVQ command if the
853 * driver disables the all hash types, which aligns with
854 * the device's defaults.
855 *
856 * Note that the device's defaults can mismatch the driver's
857 * configuration only at live migration.
858 */
859 if (!n->rss_data.enabled ||
860 n->rss_data.hash_types == VIRTIO_NET_HASH_REPORT_NONE) {
861 return 0;
862 }
863
864 table = g_malloc_n(n->rss_data.indirections_len,
865 sizeof(n->rss_data.indirections_table[0]));
866 cfg.hash_types = cpu_to_le32(n->rss_data.hash_types);
867
868 if (do_rss) {
869 /*
870 * According to VirtIO standard, "Number of entries in indirection_table
871 * is (indirection_table_mask + 1)".
872 */
873 cfg.indirection_table_mask = cpu_to_le16(n->rss_data.indirections_len -
874 1);
875 cfg.unclassified_queue = cpu_to_le16(n->rss_data.default_queue);
876 for (int i = 0; i < n->rss_data.indirections_len; ++i) {
877 table[i] = cpu_to_le16(n->rss_data.indirections_table[i]);
878 }
879 cfg.max_tx_vq = cpu_to_le16(n->curr_queue_pairs);
880 } else {
881 /*
882 * According to VirtIO standard, "Field reserved MUST contain zeroes.
883 * It is defined to make the structure to match the layout of
884 * virtio_net_rss_config structure, defined in 5.1.6.5.7.".
885 *
886 * Therefore, we need to zero the fields in
887 * struct virtio_net_rss_config, which corresponds to the
888 * `reserved` field in struct virtio_net_hash_config.
889 *
890 * Note that all other fields are zeroed at their definitions,
891 * except for the `indirection_table` field, where the actual data
892 * is stored in the `table` variable to ensure compatibility
893 * with RSS case. Therefore, we need to zero the `table` variable here.
894 */
895 table[0] = 0;
896 }
897
898 /*
899 * Considering that virtio_net_handle_rss() currently does not restore
900 * the hash key length parsed from the CVQ command sent from the guest
901 * into n->rss_data and uses the maximum key length in other code, so
902 * we also employ the maximum key length here.
903 */
904 cfg.hash_key_length = sizeof(n->rss_data.key);
905
906 const struct iovec data[] = {
907 {
908 .iov_base = &cfg,
909 .iov_len = offsetof(struct virtio_net_rss_config,
910 indirection_table),
911 }, {
912 .iov_base = table,
913 .iov_len = n->rss_data.indirections_len *
914 sizeof(n->rss_data.indirections_table[0]),
915 }, {
916 .iov_base = &cfg.max_tx_vq,
917 .iov_len = offsetof(struct virtio_net_rss_config, hash_key_data) -
918 offsetof(struct virtio_net_rss_config, max_tx_vq),
919 }, {
920 .iov_base = (void *)n->rss_data.key,
921 .iov_len = sizeof(n->rss_data.key),
922 }
923 };
924
925 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor,
926 VIRTIO_NET_CTRL_MQ,
927 do_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG :
928 VIRTIO_NET_CTRL_MQ_HASH_CONFIG,
929 data, ARRAY_SIZE(data));
930 if (unlikely(r < 0)) {
931 return r;
932 }
933
934 return 0;
935 }
936
vhost_vdpa_net_load_mq(VhostVDPAState * s,const VirtIONet * n,struct iovec * out_cursor,struct iovec * in_cursor)937 static int vhost_vdpa_net_load_mq(VhostVDPAState *s,
938 const VirtIONet *n,
939 struct iovec *out_cursor,
940 struct iovec *in_cursor)
941 {
942 struct virtio_net_ctrl_mq mq;
943 ssize_t r;
944
945 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_MQ)) {
946 return 0;
947 }
948
949 trace_vhost_vdpa_net_load_mq(s, n->curr_queue_pairs);
950
951 mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs);
952 const struct iovec data = {
953 .iov_base = &mq,
954 .iov_len = sizeof(mq),
955 };
956 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor,
957 VIRTIO_NET_CTRL_MQ,
958 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET,
959 &data, 1);
960 if (unlikely(r < 0)) {
961 return r;
962 }
963
964 if (virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_RSS)) {
965 /* load the receive-side scaling state */
966 r = vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor, true);
967 if (unlikely(r < 0)) {
968 return r;
969 }
970 } else if (virtio_vdev_has_feature(&n->parent_obj,
971 VIRTIO_NET_F_HASH_REPORT)) {
972 /* load the hash calculation state */
973 r = vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor, false);
974 if (unlikely(r < 0)) {
975 return r;
976 }
977 }
978
979 return 0;
980 }
981
vhost_vdpa_net_load_offloads(VhostVDPAState * s,const VirtIONet * n,struct iovec * out_cursor,struct iovec * in_cursor)982 static int vhost_vdpa_net_load_offloads(VhostVDPAState *s,
983 const VirtIONet *n,
984 struct iovec *out_cursor,
985 struct iovec *in_cursor)
986 {
987 uint64_t offloads;
988 ssize_t r;
989
990 if (!virtio_vdev_has_feature(&n->parent_obj,
991 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) {
992 return 0;
993 }
994
995 if (n->curr_guest_offloads == virtio_net_supported_guest_offloads(n)) {
996 /*
997 * According to VirtIO standard, "Upon feature negotiation
998 * corresponding offload gets enabled to preserve
999 * backward compatibility.".
1000 *
1001 * Therefore, there is no need to send this CVQ command if the
1002 * driver also enables all supported offloads, which aligns with
1003 * the device's defaults.
1004 *
1005 * Note that the device's defaults can mismatch the driver's
1006 * configuration only at live migration.
1007 */
1008 return 0;
1009 }
1010
1011 offloads = cpu_to_le64(n->curr_guest_offloads);
1012 const struct iovec data = {
1013 .iov_base = &offloads,
1014 .iov_len = sizeof(offloads),
1015 };
1016 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor,
1017 VIRTIO_NET_CTRL_GUEST_OFFLOADS,
1018 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET,
1019 &data, 1);
1020 if (unlikely(r < 0)) {
1021 return r;
1022 }
1023
1024 return 0;
1025 }
1026
vhost_vdpa_net_load_rx_mode(VhostVDPAState * s,struct iovec * out_cursor,struct iovec * in_cursor,uint8_t cmd,uint8_t on)1027 static int vhost_vdpa_net_load_rx_mode(VhostVDPAState *s,
1028 struct iovec *out_cursor,
1029 struct iovec *in_cursor,
1030 uint8_t cmd,
1031 uint8_t on)
1032 {
1033 const struct iovec data = {
1034 .iov_base = &on,
1035 .iov_len = sizeof(on),
1036 };
1037 ssize_t r;
1038
1039 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor,
1040 VIRTIO_NET_CTRL_RX, cmd, &data, 1);
1041 if (unlikely(r < 0)) {
1042 return r;
1043 }
1044
1045 return 0;
1046 }
1047
vhost_vdpa_net_load_rx(VhostVDPAState * s,const VirtIONet * n,struct iovec * out_cursor,struct iovec * in_cursor)1048 static int vhost_vdpa_net_load_rx(VhostVDPAState *s,
1049 const VirtIONet *n,
1050 struct iovec *out_cursor,
1051 struct iovec *in_cursor)
1052 {
1053 ssize_t r;
1054
1055 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_RX)) {
1056 return 0;
1057 }
1058
1059 /*
1060 * According to virtio_net_reset(), device turns promiscuous mode
1061 * on by default.
1062 *
1063 * Additionally, according to VirtIO standard, "Since there are
1064 * no guarantees, it can use a hash filter or silently switch to
1065 * allmulti or promiscuous mode if it is given too many addresses.".
1066 * QEMU marks `n->mac_table.uni_overflow` if guest sets too many
1067 * non-multicast MAC addresses, indicating that promiscuous mode
1068 * should be enabled.
1069 *
1070 * Therefore, QEMU should only send this CVQ command if the
1071 * `n->mac_table.uni_overflow` is not marked and `n->promisc` is off,
1072 * which sets promiscuous mode on, different from the device's defaults.
1073 *
1074 * Note that the device's defaults can mismatch the driver's
1075 * configuration only at live migration.
1076 */
1077 if (!n->mac_table.uni_overflow && !n->promisc) {
1078 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor,
1079 VIRTIO_NET_CTRL_RX_PROMISC, 0);
1080 if (unlikely(r < 0)) {
1081 return r;
1082 }
1083 }
1084
1085 /*
1086 * According to virtio_net_reset(), device turns all-multicast mode
1087 * off by default.
1088 *
1089 * According to VirtIO standard, "Since there are no guarantees,
1090 * it can use a hash filter or silently switch to allmulti or
1091 * promiscuous mode if it is given too many addresses.". QEMU marks
1092 * `n->mac_table.multi_overflow` if guest sets too many
1093 * non-multicast MAC addresses.
1094 *
1095 * Therefore, QEMU should only send this CVQ command if the
1096 * `n->mac_table.multi_overflow` is marked or `n->allmulti` is on,
1097 * which sets all-multicast mode on, different from the device's defaults.
1098 *
1099 * Note that the device's defaults can mismatch the driver's
1100 * configuration only at live migration.
1101 */
1102 if (n->mac_table.multi_overflow || n->allmulti) {
1103 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor,
1104 VIRTIO_NET_CTRL_RX_ALLMULTI, 1);
1105 if (unlikely(r < 0)) {
1106 return r;
1107 }
1108 }
1109
1110 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_RX_EXTRA)) {
1111 return 0;
1112 }
1113
1114 /*
1115 * According to virtio_net_reset(), device turns all-unicast mode
1116 * off by default.
1117 *
1118 * Therefore, QEMU should only send this CVQ command if the driver
1119 * sets all-unicast mode on, different from the device's defaults.
1120 *
1121 * Note that the device's defaults can mismatch the driver's
1122 * configuration only at live migration.
1123 */
1124 if (n->alluni) {
1125 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor,
1126 VIRTIO_NET_CTRL_RX_ALLUNI, 1);
1127 if (r < 0) {
1128 return r;
1129 }
1130 }
1131
1132 /*
1133 * According to virtio_net_reset(), device turns non-multicast mode
1134 * off by default.
1135 *
1136 * Therefore, QEMU should only send this CVQ command if the driver
1137 * sets non-multicast mode on, different from the device's defaults.
1138 *
1139 * Note that the device's defaults can mismatch the driver's
1140 * configuration only at live migration.
1141 */
1142 if (n->nomulti) {
1143 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor,
1144 VIRTIO_NET_CTRL_RX_NOMULTI, 1);
1145 if (r < 0) {
1146 return r;
1147 }
1148 }
1149
1150 /*
1151 * According to virtio_net_reset(), device turns non-unicast mode
1152 * off by default.
1153 *
1154 * Therefore, QEMU should only send this CVQ command if the driver
1155 * sets non-unicast mode on, different from the device's defaults.
1156 *
1157 * Note that the device's defaults can mismatch the driver's
1158 * configuration only at live migration.
1159 */
1160 if (n->nouni) {
1161 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor,
1162 VIRTIO_NET_CTRL_RX_NOUNI, 1);
1163 if (r < 0) {
1164 return r;
1165 }
1166 }
1167
1168 /*
1169 * According to virtio_net_reset(), device turns non-broadcast mode
1170 * off by default.
1171 *
1172 * Therefore, QEMU should only send this CVQ command if the driver
1173 * sets non-broadcast mode on, different from the device's defaults.
1174 *
1175 * Note that the device's defaults can mismatch the driver's
1176 * configuration only at live migration.
1177 */
1178 if (n->nobcast) {
1179 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor,
1180 VIRTIO_NET_CTRL_RX_NOBCAST, 1);
1181 if (r < 0) {
1182 return r;
1183 }
1184 }
1185
1186 return 0;
1187 }
1188
vhost_vdpa_net_load_single_vlan(VhostVDPAState * s,const VirtIONet * n,struct iovec * out_cursor,struct iovec * in_cursor,uint16_t vid)1189 static int vhost_vdpa_net_load_single_vlan(VhostVDPAState *s,
1190 const VirtIONet *n,
1191 struct iovec *out_cursor,
1192 struct iovec *in_cursor,
1193 uint16_t vid)
1194 {
1195 const struct iovec data = {
1196 .iov_base = &vid,
1197 .iov_len = sizeof(vid),
1198 };
1199 ssize_t r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor,
1200 VIRTIO_NET_CTRL_VLAN,
1201 VIRTIO_NET_CTRL_VLAN_ADD,
1202 &data, 1);
1203 if (unlikely(r < 0)) {
1204 return r;
1205 }
1206
1207 return 0;
1208 }
1209
vhost_vdpa_net_load_vlan(VhostVDPAState * s,const VirtIONet * n,struct iovec * out_cursor,struct iovec * in_cursor)1210 static int vhost_vdpa_net_load_vlan(VhostVDPAState *s,
1211 const VirtIONet *n,
1212 struct iovec *out_cursor,
1213 struct iovec *in_cursor)
1214 {
1215 int r;
1216
1217 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_VLAN)) {
1218 return 0;
1219 }
1220
1221 for (int i = 0; i < MAX_VLAN >> 5; i++) {
1222 for (int j = 0; n->vlans[i] && j <= 0x1f; j++) {
1223 if (n->vlans[i] & (1U << j)) {
1224 r = vhost_vdpa_net_load_single_vlan(s, n, out_cursor,
1225 in_cursor, (i << 5) + j);
1226 if (unlikely(r != 0)) {
1227 return r;
1228 }
1229 }
1230 }
1231 }
1232
1233 return 0;
1234 }
1235
vhost_vdpa_net_cvq_load(NetClientState * nc)1236 static int vhost_vdpa_net_cvq_load(NetClientState *nc)
1237 {
1238 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
1239 struct vhost_vdpa *v = &s->vhost_vdpa;
1240 const VirtIONet *n;
1241 int r;
1242 struct iovec out_cursor, in_cursor;
1243
1244 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
1245
1246 r = vhost_vdpa_set_vring_ready(v, v->dev->vq_index);
1247 if (unlikely(r < 0)) {
1248 return r;
1249 }
1250
1251 if (v->shadow_vqs_enabled) {
1252 n = VIRTIO_NET(v->dev->vdev);
1253 vhost_vdpa_net_load_cursor_reset(s, &out_cursor, &in_cursor);
1254 r = vhost_vdpa_net_load_mac(s, n, &out_cursor, &in_cursor);
1255 if (unlikely(r < 0)) {
1256 return r;
1257 }
1258 r = vhost_vdpa_net_load_mq(s, n, &out_cursor, &in_cursor);
1259 if (unlikely(r)) {
1260 return r;
1261 }
1262 r = vhost_vdpa_net_load_offloads(s, n, &out_cursor, &in_cursor);
1263 if (unlikely(r)) {
1264 return r;
1265 }
1266 r = vhost_vdpa_net_load_rx(s, n, &out_cursor, &in_cursor);
1267 if (unlikely(r)) {
1268 return r;
1269 }
1270 r = vhost_vdpa_net_load_vlan(s, n, &out_cursor, &in_cursor);
1271 if (unlikely(r)) {
1272 return r;
1273 }
1274
1275 /*
1276 * We need to poll and check all pending device's used buffers.
1277 *
1278 * We can poll here since we've had BQL from the time
1279 * we sent the descriptor.
1280 */
1281 r = vhost_vdpa_net_svq_flush(s, in_cursor.iov_base - (void *)s->status);
1282 if (unlikely(r)) {
1283 return r;
1284 }
1285 }
1286
1287 for (int i = 0; i < v->dev->vq_index; ++i) {
1288 r = vhost_vdpa_set_vring_ready(v, i);
1289 if (unlikely(r < 0)) {
1290 return r;
1291 }
1292 }
1293
1294 return 0;
1295 }
1296
1297 static NetClientInfo net_vhost_vdpa_cvq_info = {
1298 .type = NET_CLIENT_DRIVER_VHOST_VDPA,
1299 .size = sizeof(VhostVDPAState),
1300 .receive = vhost_vdpa_receive,
1301 .start = vhost_vdpa_net_cvq_start,
1302 .load = vhost_vdpa_net_cvq_load,
1303 .stop = vhost_vdpa_net_cvq_stop,
1304 .cleanup = vhost_vdpa_cleanup,
1305 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
1306 .has_ufo = vhost_vdpa_has_ufo,
1307 .check_peer_type = vhost_vdpa_check_peer_type,
1308 .set_steering_ebpf = vhost_vdpa_set_steering_ebpf,
1309 };
1310
1311 /*
1312 * Forward the excessive VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command to
1313 * vdpa device.
1314 *
1315 * Considering that QEMU cannot send the entire filter table to the
1316 * vdpa device, it should send the VIRTIO_NET_CTRL_RX_PROMISC CVQ
1317 * command to enable promiscuous mode to receive all packets,
1318 * according to VirtIO standard, "Since there are no guarantees,
1319 * it can use a hash filter or silently switch to allmulti or
1320 * promiscuous mode if it is given too many addresses.".
1321 *
1322 * Since QEMU ignores MAC addresses beyond `MAC_TABLE_ENTRIES` and
1323 * marks `n->mac_table.x_overflow` accordingly, it should have
1324 * the same effect on the device model to receive
1325 * (`MAC_TABLE_ENTRIES` + 1) or more non-multicast MAC addresses.
1326 * The same applies to multicast MAC addresses.
1327 *
1328 * Therefore, QEMU can provide the device model with a fake
1329 * VIRTIO_NET_CTRL_MAC_TABLE_SET command with (`MAC_TABLE_ENTRIES` + 1)
1330 * non-multicast MAC addresses and (`MAC_TABLE_ENTRIES` + 1) multicast
1331 * MAC addresses. This ensures that the device model marks
1332 * `n->mac_table.uni_overflow` and `n->mac_table.multi_overflow`,
1333 * allowing all packets to be received, which aligns with the
1334 * state of the vdpa device.
1335 */
vhost_vdpa_net_excessive_mac_filter_cvq_add(VhostVDPAState * s,VirtQueueElement * elem,struct iovec * out,const struct iovec * in)1336 static int vhost_vdpa_net_excessive_mac_filter_cvq_add(VhostVDPAState *s,
1337 VirtQueueElement *elem,
1338 struct iovec *out,
1339 const struct iovec *in)
1340 {
1341 struct virtio_net_ctrl_mac mac_data, *mac_ptr;
1342 struct virtio_net_ctrl_hdr *hdr_ptr;
1343 uint32_t cursor;
1344 ssize_t r;
1345 uint8_t on = 1;
1346
1347 /* parse the non-multicast MAC address entries from CVQ command */
1348 cursor = sizeof(*hdr_ptr);
1349 r = iov_to_buf(elem->out_sg, elem->out_num, cursor,
1350 &mac_data, sizeof(mac_data));
1351 if (unlikely(r != sizeof(mac_data))) {
1352 /*
1353 * If the CVQ command is invalid, we should simulate the vdpa device
1354 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1355 */
1356 *s->status = VIRTIO_NET_ERR;
1357 return sizeof(*s->status);
1358 }
1359 cursor += sizeof(mac_data) + le32_to_cpu(mac_data.entries) * ETH_ALEN;
1360
1361 /* parse the multicast MAC address entries from CVQ command */
1362 r = iov_to_buf(elem->out_sg, elem->out_num, cursor,
1363 &mac_data, sizeof(mac_data));
1364 if (r != sizeof(mac_data)) {
1365 /*
1366 * If the CVQ command is invalid, we should simulate the vdpa device
1367 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1368 */
1369 *s->status = VIRTIO_NET_ERR;
1370 return sizeof(*s->status);
1371 }
1372 cursor += sizeof(mac_data) + le32_to_cpu(mac_data.entries) * ETH_ALEN;
1373
1374 /* validate the CVQ command */
1375 if (iov_size(elem->out_sg, elem->out_num) != cursor) {
1376 /*
1377 * If the CVQ command is invalid, we should simulate the vdpa device
1378 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1379 */
1380 *s->status = VIRTIO_NET_ERR;
1381 return sizeof(*s->status);
1382 }
1383
1384 /*
1385 * According to VirtIO standard, "Since there are no guarantees,
1386 * it can use a hash filter or silently switch to allmulti or
1387 * promiscuous mode if it is given too many addresses.".
1388 *
1389 * Therefore, considering that QEMU is unable to send the entire
1390 * filter table to the vdpa device, it should send the
1391 * VIRTIO_NET_CTRL_RX_PROMISC CVQ command to enable promiscuous mode
1392 */
1393 hdr_ptr = out->iov_base;
1394 out->iov_len = sizeof(*hdr_ptr) + sizeof(on);
1395
1396 hdr_ptr->class = VIRTIO_NET_CTRL_RX;
1397 hdr_ptr->cmd = VIRTIO_NET_CTRL_RX_PROMISC;
1398 iov_from_buf(out, 1, sizeof(*hdr_ptr), &on, sizeof(on));
1399 r = vhost_vdpa_net_cvq_add(s, out, 1, in, 1);
1400 if (unlikely(r < 0)) {
1401 return r;
1402 }
1403
1404 /*
1405 * We can poll here since we've had BQL from the time
1406 * we sent the descriptor.
1407 */
1408 r = vhost_vdpa_net_svq_poll(s, 1);
1409 if (unlikely(r < sizeof(*s->status))) {
1410 return r;
1411 }
1412 if (*s->status != VIRTIO_NET_OK) {
1413 return sizeof(*s->status);
1414 }
1415
1416 /*
1417 * QEMU should also send a fake VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ
1418 * command to the device model, including (`MAC_TABLE_ENTRIES` + 1)
1419 * non-multicast MAC addresses and (`MAC_TABLE_ENTRIES` + 1)
1420 * multicast MAC addresses.
1421 *
1422 * By doing so, the device model can mark `n->mac_table.uni_overflow`
1423 * and `n->mac_table.multi_overflow`, enabling all packets to be
1424 * received, which aligns with the state of the vdpa device.
1425 */
1426 cursor = 0;
1427 uint32_t fake_uni_entries = MAC_TABLE_ENTRIES + 1,
1428 fake_mul_entries = MAC_TABLE_ENTRIES + 1,
1429 fake_cvq_size = sizeof(struct virtio_net_ctrl_hdr) +
1430 sizeof(mac_data) + fake_uni_entries * ETH_ALEN +
1431 sizeof(mac_data) + fake_mul_entries * ETH_ALEN;
1432
1433 assert(fake_cvq_size < vhost_vdpa_net_cvq_cmd_page_len());
1434 out->iov_len = fake_cvq_size;
1435
1436 /* pack the header for fake CVQ command */
1437 hdr_ptr = out->iov_base + cursor;
1438 hdr_ptr->class = VIRTIO_NET_CTRL_MAC;
1439 hdr_ptr->cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET;
1440 cursor += sizeof(*hdr_ptr);
1441
1442 /*
1443 * Pack the non-multicast MAC addresses part for fake CVQ command.
1444 *
1445 * According to virtio_net_handle_mac(), QEMU doesn't verify the MAC
1446 * addresses provided in CVQ command. Therefore, only the entries
1447 * field need to be prepared in the CVQ command.
1448 */
1449 mac_ptr = out->iov_base + cursor;
1450 mac_ptr->entries = cpu_to_le32(fake_uni_entries);
1451 cursor += sizeof(*mac_ptr) + fake_uni_entries * ETH_ALEN;
1452
1453 /*
1454 * Pack the multicast MAC addresses part for fake CVQ command.
1455 *
1456 * According to virtio_net_handle_mac(), QEMU doesn't verify the MAC
1457 * addresses provided in CVQ command. Therefore, only the entries
1458 * field need to be prepared in the CVQ command.
1459 */
1460 mac_ptr = out->iov_base + cursor;
1461 mac_ptr->entries = cpu_to_le32(fake_mul_entries);
1462
1463 /*
1464 * Simulating QEMU poll a vdpa device used buffer
1465 * for VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1466 */
1467 return sizeof(*s->status);
1468 }
1469
1470 /**
1471 * Validate and copy control virtqueue commands.
1472 *
1473 * Following QEMU guidelines, we offer a copy of the buffers to the device to
1474 * prevent TOCTOU bugs.
1475 */
vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue * svq,VirtQueueElement * elem,void * opaque)1476 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq,
1477 VirtQueueElement *elem,
1478 void *opaque)
1479 {
1480 VhostVDPAState *s = opaque;
1481 size_t in_len;
1482 const struct virtio_net_ctrl_hdr *ctrl;
1483 virtio_net_ctrl_ack status = VIRTIO_NET_ERR;
1484 /* Out buffer sent to both the vdpa device and the device model */
1485 struct iovec out = {
1486 .iov_base = s->cvq_cmd_out_buffer,
1487 };
1488 /* in buffer used for device model */
1489 const struct iovec model_in = {
1490 .iov_base = &status,
1491 .iov_len = sizeof(status),
1492 };
1493 /* in buffer used for vdpa device */
1494 const struct iovec vdpa_in = {
1495 .iov_base = s->status,
1496 .iov_len = sizeof(*s->status),
1497 };
1498 ssize_t dev_written = -EINVAL;
1499
1500 out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0,
1501 s->cvq_cmd_out_buffer,
1502 vhost_vdpa_net_cvq_cmd_page_len());
1503
1504 ctrl = s->cvq_cmd_out_buffer;
1505 if (ctrl->class == VIRTIO_NET_CTRL_ANNOUNCE) {
1506 /*
1507 * Guest announce capability is emulated by qemu, so don't forward to
1508 * the device.
1509 */
1510 dev_written = sizeof(status);
1511 *s->status = VIRTIO_NET_OK;
1512 } else if (unlikely(ctrl->class == VIRTIO_NET_CTRL_MAC &&
1513 ctrl->cmd == VIRTIO_NET_CTRL_MAC_TABLE_SET &&
1514 iov_size(elem->out_sg, elem->out_num) > out.iov_len)) {
1515 /*
1516 * Due to the size limitation of the out buffer sent to the vdpa device,
1517 * which is determined by vhost_vdpa_net_cvq_cmd_page_len(), excessive
1518 * MAC addresses set by the driver for the filter table can cause
1519 * truncation of the CVQ command in QEMU. As a result, the vdpa device
1520 * rejects the flawed CVQ command.
1521 *
1522 * Therefore, QEMU must handle this situation instead of sending
1523 * the CVQ command directly.
1524 */
1525 dev_written = vhost_vdpa_net_excessive_mac_filter_cvq_add(s, elem,
1526 &out, &vdpa_in);
1527 if (unlikely(dev_written < 0)) {
1528 goto out;
1529 }
1530 } else {
1531 ssize_t r;
1532 r = vhost_vdpa_net_cvq_add(s, &out, 1, &vdpa_in, 1);
1533 if (unlikely(r < 0)) {
1534 dev_written = r;
1535 goto out;
1536 }
1537
1538 /*
1539 * We can poll here since we've had BQL from the time
1540 * we sent the descriptor.
1541 */
1542 dev_written = vhost_vdpa_net_svq_poll(s, 1);
1543 }
1544
1545 if (unlikely(dev_written < sizeof(status))) {
1546 error_report("Insufficient written data (%zu)", dev_written);
1547 goto out;
1548 }
1549
1550 if (*s->status != VIRTIO_NET_OK) {
1551 goto out;
1552 }
1553
1554 status = VIRTIO_NET_ERR;
1555 virtio_net_handle_ctrl_iov(svq->vdev, &model_in, 1, &out, 1);
1556 if (status != VIRTIO_NET_OK) {
1557 error_report("Bad CVQ processing in model");
1558 }
1559
1560 out:
1561 in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status,
1562 sizeof(status));
1563 if (unlikely(in_len < sizeof(status))) {
1564 error_report("Bad device CVQ written length");
1565 }
1566 vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status)));
1567 /*
1568 * `elem` belongs to vhost_vdpa_net_handle_ctrl_avail() only when
1569 * the function successfully forwards the CVQ command, indicated
1570 * by a non-negative value of `dev_written`. Otherwise, it still
1571 * belongs to SVQ.
1572 * This function should only free the `elem` when it owns.
1573 */
1574 if (dev_written >= 0) {
1575 g_free(elem);
1576 }
1577 return dev_written < 0 ? dev_written : 0;
1578 }
1579
1580 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = {
1581 .avail_handler = vhost_vdpa_net_handle_ctrl_avail,
1582 };
1583
1584 /**
1585 * Probe if CVQ is isolated
1586 *
1587 * @device_fd The vdpa device fd
1588 * @features Features offered by the device.
1589 * @cvq_index The control vq pair index
1590 *
1591 * Returns <0 in case of failure, 0 if false and 1 if true.
1592 */
vhost_vdpa_probe_cvq_isolation(int device_fd,uint64_t features,int cvq_index,Error ** errp)1593 static int vhost_vdpa_probe_cvq_isolation(int device_fd, uint64_t features,
1594 int cvq_index, Error **errp)
1595 {
1596 ERRP_GUARD();
1597 uint64_t backend_features;
1598 int64_t cvq_group;
1599 uint8_t status = VIRTIO_CONFIG_S_ACKNOWLEDGE |
1600 VIRTIO_CONFIG_S_DRIVER;
1601 int r;
1602
1603 r = ioctl(device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features);
1604 if (unlikely(r < 0)) {
1605 error_setg_errno(errp, errno, "Cannot get vdpa backend_features");
1606 return r;
1607 }
1608
1609 if (!(backend_features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) {
1610 return 0;
1611 }
1612
1613 r = ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status);
1614 if (unlikely(r)) {
1615 error_setg_errno(errp, -r, "Cannot set device status");
1616 goto out;
1617 }
1618
1619 r = ioctl(device_fd, VHOST_SET_FEATURES, &features);
1620 if (unlikely(r)) {
1621 error_setg_errno(errp, -r, "Cannot set features");
1622 goto out;
1623 }
1624
1625 status |= VIRTIO_CONFIG_S_FEATURES_OK;
1626 r = ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status);
1627 if (unlikely(r)) {
1628 error_setg_errno(errp, -r, "Cannot set device status");
1629 goto out;
1630 }
1631
1632 cvq_group = vhost_vdpa_get_vring_group(device_fd, cvq_index, errp);
1633 if (unlikely(cvq_group < 0)) {
1634 if (cvq_group != -ENOTSUP) {
1635 r = cvq_group;
1636 goto out;
1637 }
1638
1639 /*
1640 * The kernel report VHOST_BACKEND_F_IOTLB_ASID if the vdpa frontend
1641 * support ASID even if the parent driver does not. The CVQ cannot be
1642 * isolated in this case.
1643 */
1644 error_free(*errp);
1645 *errp = NULL;
1646 r = 0;
1647 goto out;
1648 }
1649
1650 for (int i = 0; i < cvq_index; ++i) {
1651 int64_t group = vhost_vdpa_get_vring_group(device_fd, i, errp);
1652 if (unlikely(group < 0)) {
1653 r = group;
1654 goto out;
1655 }
1656
1657 if (group == (int64_t)cvq_group) {
1658 r = 0;
1659 goto out;
1660 }
1661 }
1662
1663 r = 1;
1664
1665 out:
1666 status = 0;
1667 ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status);
1668 return r;
1669 }
1670
net_vhost_vdpa_init(NetClientState * peer,const char * device,const char * name,int vdpa_device_fd,int queue_pair_index,int nvqs,bool is_datapath,bool svq,struct vhost_vdpa_iova_range iova_range,uint64_t features,VhostVDPAShared * shared,Error ** errp)1671 static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
1672 const char *device,
1673 const char *name,
1674 int vdpa_device_fd,
1675 int queue_pair_index,
1676 int nvqs,
1677 bool is_datapath,
1678 bool svq,
1679 struct vhost_vdpa_iova_range iova_range,
1680 uint64_t features,
1681 VhostVDPAShared *shared,
1682 Error **errp)
1683 {
1684 NetClientState *nc = NULL;
1685 VhostVDPAState *s;
1686 int ret = 0;
1687 assert(name);
1688 int cvq_isolated = 0;
1689
1690 if (is_datapath) {
1691 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device,
1692 name);
1693 } else {
1694 cvq_isolated = vhost_vdpa_probe_cvq_isolation(vdpa_device_fd, features,
1695 queue_pair_index * 2,
1696 errp);
1697 if (unlikely(cvq_isolated < 0)) {
1698 return NULL;
1699 }
1700
1701 nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer,
1702 device, name);
1703 }
1704 qemu_set_info_str(nc, TYPE_VHOST_VDPA);
1705 s = DO_UPCAST(VhostVDPAState, nc, nc);
1706
1707 s->vhost_vdpa.index = queue_pair_index;
1708 s->always_svq = svq;
1709 s->migration_state.notify = NULL;
1710 s->vhost_vdpa.shadow_vqs_enabled = svq;
1711 if (queue_pair_index == 0) {
1712 vhost_vdpa_net_valid_svq_features(features,
1713 &s->vhost_vdpa.migration_blocker);
1714 s->vhost_vdpa.shared = g_new0(VhostVDPAShared, 1);
1715 s->vhost_vdpa.shared->device_fd = vdpa_device_fd;
1716 s->vhost_vdpa.shared->iova_range = iova_range;
1717 s->vhost_vdpa.shared->shadow_data = svq;
1718 } else if (!is_datapath) {
1719 s->cvq_cmd_out_buffer = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(),
1720 PROT_READ | PROT_WRITE,
1721 MAP_SHARED | MAP_ANONYMOUS, -1, 0);
1722 s->status = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(),
1723 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS,
1724 -1, 0);
1725
1726 s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops;
1727 s->vhost_vdpa.shadow_vq_ops_opaque = s;
1728 s->cvq_isolated = cvq_isolated;
1729 }
1730 if (queue_pair_index != 0) {
1731 s->vhost_vdpa.shared = shared;
1732 }
1733
1734 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs);
1735 if (ret) {
1736 qemu_del_net_client(nc);
1737 return NULL;
1738 }
1739
1740 return nc;
1741 }
1742
vhost_vdpa_get_features(int fd,uint64_t * features,Error ** errp)1743 static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp)
1744 {
1745 int ret = ioctl(fd, VHOST_GET_FEATURES, features);
1746 if (unlikely(ret < 0)) {
1747 error_setg_errno(errp, errno,
1748 "Fail to query features from vhost-vDPA device");
1749 }
1750 return ret;
1751 }
1752
vhost_vdpa_get_max_queue_pairs(int fd,uint64_t features,int * has_cvq,Error ** errp)1753 static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features,
1754 int *has_cvq, Error **errp)
1755 {
1756 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf);
1757 g_autofree struct vhost_vdpa_config *config = NULL;
1758 __virtio16 *max_queue_pairs;
1759 int ret;
1760
1761 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) {
1762 *has_cvq = 1;
1763 } else {
1764 *has_cvq = 0;
1765 }
1766
1767 if (features & (1 << VIRTIO_NET_F_MQ)) {
1768 config = g_malloc0(config_size + sizeof(*max_queue_pairs));
1769 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs);
1770 config->len = sizeof(*max_queue_pairs);
1771
1772 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config);
1773 if (ret) {
1774 error_setg(errp, "Fail to get config from vhost-vDPA device");
1775 return -ret;
1776 }
1777
1778 max_queue_pairs = (__virtio16 *)&config->buf;
1779
1780 return lduw_le_p(max_queue_pairs);
1781 }
1782
1783 return 1;
1784 }
1785
net_init_vhost_vdpa(const Netdev * netdev,const char * name,NetClientState * peer,Error ** errp)1786 int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
1787 NetClientState *peer, Error **errp)
1788 {
1789 ERRP_GUARD();
1790 const NetdevVhostVDPAOptions *opts;
1791 uint64_t features;
1792 int vdpa_device_fd;
1793 g_autofree NetClientState **ncs = NULL;
1794 struct vhost_vdpa_iova_range iova_range;
1795 NetClientState *nc;
1796 int queue_pairs, r, i = 0, has_cvq = 0;
1797
1798 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
1799 opts = &netdev->u.vhost_vdpa;
1800 if (!opts->vhostdev && !opts->vhostfd) {
1801 error_setg(errp,
1802 "vhost-vdpa: neither vhostdev= nor vhostfd= was specified");
1803 return -1;
1804 }
1805
1806 if (opts->vhostdev && opts->vhostfd) {
1807 error_setg(errp,
1808 "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive");
1809 return -1;
1810 }
1811
1812 if (opts->vhostdev) {
1813 vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp);
1814 if (vdpa_device_fd == -1) {
1815 return -errno;
1816 }
1817 } else {
1818 /* has_vhostfd */
1819 vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp);
1820 if (vdpa_device_fd == -1) {
1821 error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: ");
1822 return -1;
1823 }
1824 }
1825
1826 r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp);
1827 if (unlikely(r < 0)) {
1828 goto err;
1829 }
1830
1831 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features,
1832 &has_cvq, errp);
1833 if (queue_pairs < 0) {
1834 qemu_close(vdpa_device_fd);
1835 return queue_pairs;
1836 }
1837
1838 r = vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range);
1839 if (unlikely(r < 0)) {
1840 error_setg(errp, "vhost-vdpa: get iova range failed: %s",
1841 strerror(-r));
1842 goto err;
1843 }
1844
1845 if (opts->x_svq && !vhost_vdpa_net_valid_svq_features(features, errp)) {
1846 goto err;
1847 }
1848
1849 ncs = g_malloc0(sizeof(*ncs) * queue_pairs);
1850
1851 for (i = 0; i < queue_pairs; i++) {
1852 VhostVDPAShared *shared = NULL;
1853
1854 if (i) {
1855 shared = DO_UPCAST(VhostVDPAState, nc, ncs[0])->vhost_vdpa.shared;
1856 }
1857 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
1858 vdpa_device_fd, i, 2, true, opts->x_svq,
1859 iova_range, features, shared, errp);
1860 if (!ncs[i])
1861 goto err;
1862 }
1863
1864 if (has_cvq) {
1865 VhostVDPAState *s0 = DO_UPCAST(VhostVDPAState, nc, ncs[0]);
1866 VhostVDPAShared *shared = s0->vhost_vdpa.shared;
1867
1868 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name,
1869 vdpa_device_fd, i, 1, false,
1870 opts->x_svq, iova_range, features, shared,
1871 errp);
1872 if (!nc)
1873 goto err;
1874 }
1875
1876 return 0;
1877
1878 err:
1879 if (i) {
1880 for (i--; i >= 0; i--) {
1881 qemu_del_net_client(ncs[i]);
1882 }
1883 }
1884
1885 qemu_close(vdpa_device_fd);
1886
1887 return -1;
1888 }
1889