4 * Copyright(c) 2017-2018 Intel Corporation.
5 * Copyright(c) 2020 Red Hat, Inc.
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.
12 #include "qemu/osdep.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"
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>
27 #include "standard-headers/linux/virtio_net.h"
28 #include "monitor/monitor.h"
29 #include "migration/migration.h"
30 #include "migration/misc.h"
31 #include "hw/virtio/vhost.h"
33 /* Todo:need to add the multiqueue support here */
34 typedef struct VhostVDPAState
{
36 struct vhost_vdpa vhost_vdpa
;
37 Notifier migration_state
;
38 VHostNetState
*vhost_net
;
40 /* Control commands shadow buffers */
41 void *cvq_cmd_out_buffer
;
42 virtio_net_ctrl_ack
*status
;
44 /* The device always have SVQ enabled */
47 /* The device can isolate CVQ in its own ASID */
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.
58 const int vdpa_feature_bits
[] = {
60 VIRTIO_F_IOMMU_PLATFORM
,
61 VIRTIO_F_NOTIFY_ON_EMPTY
,
66 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
,
67 VIRTIO_NET_F_CTRL_MAC_ADDR
,
69 VIRTIO_NET_F_CTRL_RX_EXTRA
,
70 VIRTIO_NET_F_CTRL_VLAN
,
73 VIRTIO_NET_F_GUEST_CSUM
,
74 VIRTIO_NET_F_GUEST_ECN
,
75 VIRTIO_NET_F_GUEST_TSO4
,
76 VIRTIO_NET_F_GUEST_TSO6
,
77 VIRTIO_NET_F_GUEST_UFO
,
78 VIRTIO_NET_F_GUEST_USO4
,
79 VIRTIO_NET_F_GUEST_USO6
,
80 VIRTIO_NET_F_HASH_REPORT
,
81 VIRTIO_NET_F_HOST_ECN
,
82 VIRTIO_NET_F_HOST_TSO4
,
83 VIRTIO_NET_F_HOST_TSO6
,
84 VIRTIO_NET_F_HOST_UFO
,
85 VIRTIO_NET_F_HOST_USO
,
87 VIRTIO_NET_F_MRG_RXBUF
,
91 VIRTIO_RING_F_EVENT_IDX
,
92 VIRTIO_RING_F_INDIRECT_DESC
,
94 /* VHOST_INVALID_FEATURE_BIT should always be the last entry */
95 VHOST_INVALID_FEATURE_BIT
98 /** Supported device specific feature bits with SVQ */
99 static const uint64_t vdpa_svq_device_features
=
100 BIT_ULL(VIRTIO_NET_F_CSUM
) |
101 BIT_ULL(VIRTIO_NET_F_GUEST_CSUM
) |
102 BIT_ULL(VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
) |
103 BIT_ULL(VIRTIO_NET_F_MTU
) |
104 BIT_ULL(VIRTIO_NET_F_MAC
) |
105 BIT_ULL(VIRTIO_NET_F_GUEST_TSO4
) |
106 BIT_ULL(VIRTIO_NET_F_GUEST_TSO6
) |
107 BIT_ULL(VIRTIO_NET_F_GUEST_ECN
) |
108 BIT_ULL(VIRTIO_NET_F_GUEST_UFO
) |
109 BIT_ULL(VIRTIO_NET_F_HOST_TSO4
) |
110 BIT_ULL(VIRTIO_NET_F_HOST_TSO6
) |
111 BIT_ULL(VIRTIO_NET_F_HOST_ECN
) |
112 BIT_ULL(VIRTIO_NET_F_HOST_UFO
) |
113 BIT_ULL(VIRTIO_NET_F_MRG_RXBUF
) |
114 BIT_ULL(VIRTIO_NET_F_STATUS
) |
115 BIT_ULL(VIRTIO_NET_F_CTRL_VQ
) |
116 BIT_ULL(VIRTIO_NET_F_CTRL_RX
) |
117 BIT_ULL(VIRTIO_NET_F_CTRL_VLAN
) |
118 BIT_ULL(VIRTIO_NET_F_CTRL_RX_EXTRA
) |
119 BIT_ULL(VIRTIO_NET_F_MQ
) |
120 BIT_ULL(VIRTIO_F_ANY_LAYOUT
) |
121 BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR
) |
122 /* VHOST_F_LOG_ALL is exposed by SVQ */
123 BIT_ULL(VHOST_F_LOG_ALL
) |
124 BIT_ULL(VIRTIO_NET_F_RSC_EXT
) |
125 BIT_ULL(VIRTIO_NET_F_STANDBY
) |
126 BIT_ULL(VIRTIO_NET_F_SPEED_DUPLEX
);
128 #define VHOST_VDPA_NET_CVQ_ASID 1
130 VHostNetState
*vhost_vdpa_get_vhost_net(NetClientState
*nc
)
132 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
133 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
137 static size_t vhost_vdpa_net_cvq_cmd_len(void)
140 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer.
141 * In buffer is always 1 byte, so it should fit here
143 return sizeof(struct virtio_net_ctrl_hdr
) +
144 2 * sizeof(struct virtio_net_ctrl_mac
) +
145 MAC_TABLE_ENTRIES
* ETH_ALEN
;
148 static size_t vhost_vdpa_net_cvq_cmd_page_len(void)
150 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size());
153 static bool vhost_vdpa_net_valid_svq_features(uint64_t features
, Error
**errp
)
155 uint64_t invalid_dev_features
=
156 features
& ~vdpa_svq_device_features
&
157 /* Transport are all accepted at this point */
158 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START
,
159 VIRTIO_TRANSPORT_F_END
- VIRTIO_TRANSPORT_F_START
);
161 if (invalid_dev_features
) {
162 error_setg(errp
, "vdpa svq does not work with features 0x%" PRIx64
,
163 invalid_dev_features
);
167 return vhost_svq_valid_features(features
, errp
);
170 static int vhost_vdpa_net_check_device_id(struct vhost_net
*net
)
174 struct vhost_dev
*hdev
;
176 hdev
= (struct vhost_dev
*)&net
->dev
;
177 ret
= hdev
->vhost_ops
->vhost_get_device_id(hdev
, &device_id
);
178 if (device_id
!= VIRTIO_ID_NET
) {
184 static int vhost_vdpa_add(NetClientState
*ncs
, void *be
,
185 int queue_pair_index
, int nvqs
)
187 VhostNetOptions options
;
188 struct vhost_net
*net
= NULL
;
192 options
.backend_type
= VHOST_BACKEND_TYPE_VDPA
;
193 assert(ncs
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
194 s
= DO_UPCAST(VhostVDPAState
, nc
, ncs
);
195 options
.net_backend
= ncs
;
197 options
.busyloop_timeout
= 0;
200 net
= vhost_net_init(&options
);
202 error_report("failed to init vhost_net for queue");
206 ret
= vhost_vdpa_net_check_device_id(net
);
212 vhost_net_cleanup(net
);
218 static void vhost_vdpa_cleanup(NetClientState
*nc
)
220 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
223 * If a peer NIC is attached, do not cleanup anything.
224 * Cleanup will happen as a part of qemu_cleanup() -> net_cleanup()
225 * when the guest is shutting down.
227 if (nc
->peer
&& nc
->peer
->info
->type
== NET_CLIENT_DRIVER_NIC
) {
230 munmap(s
->cvq_cmd_out_buffer
, vhost_vdpa_net_cvq_cmd_page_len());
231 munmap(s
->status
, vhost_vdpa_net_cvq_cmd_page_len());
233 vhost_net_cleanup(s
->vhost_net
);
234 g_free(s
->vhost_net
);
237 if (s
->vhost_vdpa
.device_fd
>= 0) {
238 qemu_close(s
->vhost_vdpa
.device_fd
);
239 s
->vhost_vdpa
.device_fd
= -1;
243 static bool vhost_vdpa_has_vnet_hdr(NetClientState
*nc
)
245 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
250 static bool vhost_vdpa_has_ufo(NetClientState
*nc
)
252 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
253 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
254 uint64_t features
= 0;
255 features
|= (1ULL << VIRTIO_NET_F_HOST_UFO
);
256 features
= vhost_net_get_features(s
->vhost_net
, features
);
257 return !!(features
& (1ULL << VIRTIO_NET_F_HOST_UFO
));
261 static bool vhost_vdpa_check_peer_type(NetClientState
*nc
, ObjectClass
*oc
,
264 const char *driver
= object_class_get_name(oc
);
266 if (!g_str_has_prefix(driver
, "virtio-net-")) {
267 error_setg(errp
, "vhost-vdpa requires frontend driver virtio-net-*");
274 /** Dummy receive in case qemu falls back to userland tap networking */
275 static ssize_t
vhost_vdpa_receive(NetClientState
*nc
, const uint8_t *buf
,
281 /** From any vdpa net client, get the netclient of the first queue pair */
282 static VhostVDPAState
*vhost_vdpa_net_first_nc_vdpa(VhostVDPAState
*s
)
284 NICState
*nic
= qemu_get_nic(s
->nc
.peer
);
285 NetClientState
*nc0
= qemu_get_peer(nic
->ncs
, 0);
287 return DO_UPCAST(VhostVDPAState
, nc
, nc0
);
290 static void vhost_vdpa_net_log_global_enable(VhostVDPAState
*s
, bool enable
)
292 struct vhost_vdpa
*v
= &s
->vhost_vdpa
;
295 int data_queue_pairs
, cvq
, r
;
297 /* We are only called on the first data vqs and only if x-svq is not set */
298 if (s
->vhost_vdpa
.shadow_vqs_enabled
== enable
) {
303 n
= VIRTIO_NET(vdev
);
304 if (!n
->vhost_started
) {
308 data_queue_pairs
= n
->multiqueue
? n
->max_queue_pairs
: 1;
309 cvq
= virtio_vdev_has_feature(vdev
, VIRTIO_NET_F_CTRL_VQ
) ?
310 n
->max_ncs
- n
->max_queue_pairs
: 0;
312 * TODO: vhost_net_stop does suspend, get_base and reset. We can be smarter
313 * in the future and resume the device if read-only operations between
314 * suspend and reset goes wrong.
316 vhost_net_stop(vdev
, n
->nic
->ncs
, data_queue_pairs
, cvq
);
318 /* Start will check migration setup_or_active to configure or not SVQ */
319 r
= vhost_net_start(vdev
, n
->nic
->ncs
, data_queue_pairs
, cvq
);
320 if (unlikely(r
< 0)) {
321 error_report("unable to start vhost net: %s(%d)", g_strerror(-r
), -r
);
325 static void vdpa_net_migration_state_notifier(Notifier
*notifier
, void *data
)
327 MigrationState
*migration
= data
;
328 VhostVDPAState
*s
= container_of(notifier
, VhostVDPAState
,
331 if (migration_in_setup(migration
)) {
332 vhost_vdpa_net_log_global_enable(s
, true);
333 } else if (migration_has_failed(migration
)) {
334 vhost_vdpa_net_log_global_enable(s
, false);
338 static void vhost_vdpa_net_data_start_first(VhostVDPAState
*s
)
340 struct vhost_vdpa
*v
= &s
->vhost_vdpa
;
342 add_migration_state_change_notifier(&s
->migration_state
);
343 if (v
->shadow_vqs_enabled
) {
344 v
->iova_tree
= vhost_iova_tree_new(v
->iova_range
.first
,
349 static int vhost_vdpa_net_data_start(NetClientState
*nc
)
351 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
352 struct vhost_vdpa
*v
= &s
->vhost_vdpa
;
354 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
357 migration_is_setup_or_active(migrate_get_current()->state
)) {
358 v
->shadow_vqs_enabled
= true;
359 v
->shadow_data
= true;
361 v
->shadow_vqs_enabled
= false;
362 v
->shadow_data
= false;
366 vhost_vdpa_net_data_start_first(s
);
370 if (v
->shadow_vqs_enabled
) {
371 VhostVDPAState
*s0
= vhost_vdpa_net_first_nc_vdpa(s
);
372 v
->iova_tree
= s0
->vhost_vdpa
.iova_tree
;
378 static int vhost_vdpa_net_data_load(NetClientState
*nc
)
380 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
381 struct vhost_vdpa
*v
= &s
->vhost_vdpa
;
382 bool has_cvq
= v
->dev
->vq_index_end
% 2;
388 for (int i
= 0; i
< v
->dev
->nvqs
; ++i
) {
389 vhost_vdpa_set_vring_ready(v
, i
+ v
->dev
->vq_index
);
394 static void vhost_vdpa_net_client_stop(NetClientState
*nc
)
396 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
397 struct vhost_dev
*dev
;
399 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
401 if (s
->vhost_vdpa
.index
== 0) {
402 remove_migration_state_change_notifier(&s
->migration_state
);
405 dev
= s
->vhost_vdpa
.dev
;
406 if (dev
->vq_index
+ dev
->nvqs
== dev
->vq_index_end
) {
407 g_clear_pointer(&s
->vhost_vdpa
.iova_tree
, vhost_iova_tree_delete
);
409 s
->vhost_vdpa
.iova_tree
= NULL
;
413 static NetClientInfo net_vhost_vdpa_info
= {
414 .type
= NET_CLIENT_DRIVER_VHOST_VDPA
,
415 .size
= sizeof(VhostVDPAState
),
416 .receive
= vhost_vdpa_receive
,
417 .start
= vhost_vdpa_net_data_start
,
418 .load
= vhost_vdpa_net_data_load
,
419 .stop
= vhost_vdpa_net_client_stop
,
420 .cleanup
= vhost_vdpa_cleanup
,
421 .has_vnet_hdr
= vhost_vdpa_has_vnet_hdr
,
422 .has_ufo
= vhost_vdpa_has_ufo
,
423 .check_peer_type
= vhost_vdpa_check_peer_type
,
426 static int64_t vhost_vdpa_get_vring_group(int device_fd
, unsigned vq_index
,
429 struct vhost_vring_state state
= {
432 int r
= ioctl(device_fd
, VHOST_VDPA_GET_VRING_GROUP
, &state
);
434 if (unlikely(r
< 0)) {
436 error_setg_errno(errp
, errno
, "Cannot get VQ %u group", vq_index
);
443 static int vhost_vdpa_set_address_space_id(struct vhost_vdpa
*v
,
447 struct vhost_vring_state asid
= {
453 r
= ioctl(v
->device_fd
, VHOST_VDPA_SET_GROUP_ASID
, &asid
);
454 if (unlikely(r
< 0)) {
455 error_report("Can't set vq group %u asid %u, errno=%d (%s)",
456 asid
.index
, asid
.num
, errno
, g_strerror(errno
));
461 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa
*v
, void *addr
)
463 VhostIOVATree
*tree
= v
->iova_tree
;
466 * No need to specify size or to look for more translations since
467 * this contiguous chunk was allocated by us.
469 .translated_addr
= (hwaddr
)(uintptr_t)addr
,
471 const DMAMap
*map
= vhost_iova_tree_find_iova(tree
, &needle
);
474 if (unlikely(!map
)) {
475 error_report("Cannot locate expected map");
479 r
= vhost_vdpa_dma_unmap(v
, v
->address_space_id
, map
->iova
, map
->size
+ 1);
480 if (unlikely(r
!= 0)) {
481 error_report("Device cannot unmap: %s(%d)", g_strerror(r
), r
);
484 vhost_iova_tree_remove(tree
, *map
);
487 /** Map CVQ buffer. */
488 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa
*v
, void *buf
, size_t size
,
494 map
.translated_addr
= (hwaddr
)(uintptr_t)buf
;
496 map
.perm
= write
? IOMMU_RW
: IOMMU_RO
,
497 r
= vhost_iova_tree_map_alloc(v
->iova_tree
, &map
);
498 if (unlikely(r
!= IOVA_OK
)) {
499 error_report("Cannot map injected element");
503 r
= vhost_vdpa_dma_map(v
, v
->address_space_id
, map
.iova
,
504 vhost_vdpa_net_cvq_cmd_page_len(), buf
, !write
);
505 if (unlikely(r
< 0)) {
512 vhost_iova_tree_remove(v
->iova_tree
, map
);
516 static int vhost_vdpa_net_cvq_start(NetClientState
*nc
)
518 VhostVDPAState
*s
, *s0
;
519 struct vhost_vdpa
*v
;
524 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
526 s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
529 s0
= vhost_vdpa_net_first_nc_vdpa(s
);
530 v
->shadow_data
= s0
->vhost_vdpa
.shadow_vqs_enabled
;
531 v
->shadow_vqs_enabled
= s0
->vhost_vdpa
.shadow_vqs_enabled
;
532 s
->vhost_vdpa
.address_space_id
= VHOST_VDPA_GUEST_PA_ASID
;
534 if (s
->vhost_vdpa
.shadow_data
) {
535 /* SVQ is already configured for all virtqueues */
540 * If we early return in these cases SVQ will not be enabled. The migration
541 * will be blocked as long as vhost-vdpa backends will not offer _F_LOG.
543 if (!vhost_vdpa_net_valid_svq_features(v
->dev
->features
, NULL
)) {
547 if (!s
->cvq_isolated
) {
551 cvq_group
= vhost_vdpa_get_vring_group(v
->device_fd
,
552 v
->dev
->vq_index_end
- 1,
554 if (unlikely(cvq_group
< 0)) {
555 error_report_err(err
);
559 r
= vhost_vdpa_set_address_space_id(v
, cvq_group
, VHOST_VDPA_NET_CVQ_ASID
);
560 if (unlikely(r
< 0)) {
564 v
->shadow_vqs_enabled
= true;
565 s
->vhost_vdpa
.address_space_id
= VHOST_VDPA_NET_CVQ_ASID
;
568 if (!s
->vhost_vdpa
.shadow_vqs_enabled
) {
572 if (s0
->vhost_vdpa
.iova_tree
) {
574 * SVQ is already configured for all virtqueues. Reuse IOVA tree for
575 * simplicity, whether CVQ shares ASID with guest or not, because:
576 * - Memory listener need access to guest's memory addresses allocated
578 * - There should be plenty of IOVA address space for both ASID not to
579 * worry about collisions between them. Guest's translations are
580 * still validated with virtio virtqueue_pop so there is no risk for
581 * the guest to access memory that it shouldn't.
583 * To allocate a iova tree per ASID is doable but it complicates the
584 * code and it is not worth it for the moment.
586 v
->iova_tree
= s0
->vhost_vdpa
.iova_tree
;
588 v
->iova_tree
= vhost_iova_tree_new(v
->iova_range
.first
,
592 r
= vhost_vdpa_cvq_map_buf(&s
->vhost_vdpa
, s
->cvq_cmd_out_buffer
,
593 vhost_vdpa_net_cvq_cmd_page_len(), false);
594 if (unlikely(r
< 0)) {
598 r
= vhost_vdpa_cvq_map_buf(&s
->vhost_vdpa
, s
->status
,
599 vhost_vdpa_net_cvq_cmd_page_len(), true);
600 if (unlikely(r
< 0)) {
601 vhost_vdpa_cvq_unmap_buf(&s
->vhost_vdpa
, s
->cvq_cmd_out_buffer
);
607 static void vhost_vdpa_net_cvq_stop(NetClientState
*nc
)
609 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
611 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
613 if (s
->vhost_vdpa
.shadow_vqs_enabled
) {
614 vhost_vdpa_cvq_unmap_buf(&s
->vhost_vdpa
, s
->cvq_cmd_out_buffer
);
615 vhost_vdpa_cvq_unmap_buf(&s
->vhost_vdpa
, s
->status
);
618 vhost_vdpa_net_client_stop(nc
);
621 static ssize_t
vhost_vdpa_net_cvq_add(VhostVDPAState
*s
, size_t out_len
,
624 /* Buffers for the device */
625 const struct iovec out
= {
626 .iov_base
= s
->cvq_cmd_out_buffer
,
629 const struct iovec in
= {
630 .iov_base
= s
->status
,
631 .iov_len
= sizeof(virtio_net_ctrl_ack
),
633 VhostShadowVirtqueue
*svq
= g_ptr_array_index(s
->vhost_vdpa
.shadow_vqs
, 0);
636 r
= vhost_svq_add(svq
, &out
, 1, &in
, 1, NULL
);
637 if (unlikely(r
!= 0)) {
638 if (unlikely(r
== -ENOSPC
)) {
639 qemu_log_mask(LOG_GUEST_ERROR
, "%s: No space on device queue\n",
646 * We can poll here since we've had BQL from the time we sent the
647 * descriptor. Also, we need to take the answer before SVQ pulls by itself,
648 * when BQL is released
650 return vhost_svq_poll(svq
, 1);
653 static ssize_t
vhost_vdpa_net_load_cmd(VhostVDPAState
*s
, uint8_t class,
654 uint8_t cmd
, const struct iovec
*data_sg
,
657 const struct virtio_net_ctrl_hdr ctrl
= {
661 size_t data_size
= iov_size(data_sg
, data_num
);
663 assert(data_size
< vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl
));
665 /* pack the CVQ command header */
666 memcpy(s
->cvq_cmd_out_buffer
, &ctrl
, sizeof(ctrl
));
668 /* pack the CVQ command command-specific-data */
669 iov_to_buf(data_sg
, data_num
, 0,
670 s
->cvq_cmd_out_buffer
+ sizeof(ctrl
), data_size
);
672 return vhost_vdpa_net_cvq_add(s
, data_size
+ sizeof(ctrl
),
673 sizeof(virtio_net_ctrl_ack
));
676 static int vhost_vdpa_net_load_mac(VhostVDPAState
*s
, const VirtIONet
*n
)
678 if (virtio_vdev_has_feature(&n
->parent_obj
, VIRTIO_NET_F_CTRL_MAC_ADDR
)) {
679 const struct iovec data
= {
680 .iov_base
= (void *)n
->mac
,
681 .iov_len
= sizeof(n
->mac
),
683 ssize_t dev_written
= vhost_vdpa_net_load_cmd(s
, VIRTIO_NET_CTRL_MAC
,
684 VIRTIO_NET_CTRL_MAC_ADDR_SET
,
686 if (unlikely(dev_written
< 0)) {
689 if (*s
->status
!= VIRTIO_NET_OK
) {
695 * According to VirtIO standard, "The device MUST have an
696 * empty MAC filtering table on reset.".
698 * Therefore, there is no need to send this CVQ command if the
699 * driver also sets an empty MAC filter table, which aligns with
700 * the device's defaults.
702 * Note that the device's defaults can mismatch the driver's
703 * configuration only at live migration.
705 if (!virtio_vdev_has_feature(&n
->parent_obj
, VIRTIO_NET_F_CTRL_RX
) ||
706 n
->mac_table
.in_use
== 0) {
710 uint32_t uni_entries
= n
->mac_table
.first_multi
,
711 uni_macs_size
= uni_entries
* ETH_ALEN
,
712 mul_entries
= n
->mac_table
.in_use
- uni_entries
,
713 mul_macs_size
= mul_entries
* ETH_ALEN
;
714 struct virtio_net_ctrl_mac uni
= {
715 .entries
= cpu_to_le32(uni_entries
),
717 struct virtio_net_ctrl_mac mul
= {
718 .entries
= cpu_to_le32(mul_entries
),
720 const struct iovec data
[] = {
723 .iov_len
= sizeof(uni
),
725 .iov_base
= n
->mac_table
.macs
,
726 .iov_len
= uni_macs_size
,
729 .iov_len
= sizeof(mul
),
731 .iov_base
= &n
->mac_table
.macs
[uni_macs_size
],
732 .iov_len
= mul_macs_size
,
735 ssize_t dev_written
= vhost_vdpa_net_load_cmd(s
,
737 VIRTIO_NET_CTRL_MAC_TABLE_SET
,
738 data
, ARRAY_SIZE(data
));
739 if (unlikely(dev_written
< 0)) {
742 if (*s
->status
!= VIRTIO_NET_OK
) {
749 static int vhost_vdpa_net_load_mq(VhostVDPAState
*s
,
752 struct virtio_net_ctrl_mq mq
;
755 if (!virtio_vdev_has_feature(&n
->parent_obj
, VIRTIO_NET_F_MQ
)) {
759 mq
.virtqueue_pairs
= cpu_to_le16(n
->curr_queue_pairs
);
760 const struct iovec data
= {
762 .iov_len
= sizeof(mq
),
764 dev_written
= vhost_vdpa_net_load_cmd(s
, VIRTIO_NET_CTRL_MQ
,
765 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET
,
767 if (unlikely(dev_written
< 0)) {
770 if (*s
->status
!= VIRTIO_NET_OK
) {
777 static int vhost_vdpa_net_load_offloads(VhostVDPAState
*s
,
783 if (!virtio_vdev_has_feature(&n
->parent_obj
,
784 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS
)) {
788 if (n
->curr_guest_offloads
== virtio_net_supported_guest_offloads(n
)) {
790 * According to VirtIO standard, "Upon feature negotiation
791 * corresponding offload gets enabled to preserve
792 * backward compatibility.".
794 * Therefore, there is no need to send this CVQ command if the
795 * driver also enables all supported offloads, which aligns with
796 * the device's defaults.
798 * Note that the device's defaults can mismatch the driver's
799 * configuration only at live migration.
804 offloads
= cpu_to_le64(n
->curr_guest_offloads
);
805 const struct iovec data
= {
806 .iov_base
= &offloads
,
807 .iov_len
= sizeof(offloads
),
809 dev_written
= vhost_vdpa_net_load_cmd(s
, VIRTIO_NET_CTRL_GUEST_OFFLOADS
,
810 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET
,
812 if (unlikely(dev_written
< 0)) {
815 if (*s
->status
!= VIRTIO_NET_OK
) {
822 static int vhost_vdpa_net_load_rx_mode(VhostVDPAState
*s
,
826 const struct iovec data
= {
828 .iov_len
= sizeof(on
),
830 return vhost_vdpa_net_load_cmd(s
, VIRTIO_NET_CTRL_RX
,
834 static int vhost_vdpa_net_load_rx(VhostVDPAState
*s
,
839 if (!virtio_vdev_has_feature(&n
->parent_obj
, VIRTIO_NET_F_CTRL_RX
)) {
844 * According to virtio_net_reset(), device turns promiscuous mode
847 * Additionally, according to VirtIO standard, "Since there are
848 * no guarantees, it can use a hash filter or silently switch to
849 * allmulti or promiscuous mode if it is given too many addresses.".
850 * QEMU marks `n->mac_table.uni_overflow` if guest sets too many
851 * non-multicast MAC addresses, indicating that promiscuous mode
854 * Therefore, QEMU should only send this CVQ command if the
855 * `n->mac_table.uni_overflow` is not marked and `n->promisc` is off,
856 * which sets promiscuous mode on, different from the device's defaults.
858 * Note that the device's defaults can mismatch the driver's
859 * configuration only at live migration.
861 if (!n
->mac_table
.uni_overflow
&& !n
->promisc
) {
862 dev_written
= vhost_vdpa_net_load_rx_mode(s
,
863 VIRTIO_NET_CTRL_RX_PROMISC
, 0);
864 if (unlikely(dev_written
< 0)) {
867 if (*s
->status
!= VIRTIO_NET_OK
) {
873 * According to virtio_net_reset(), device turns all-multicast mode
876 * According to VirtIO standard, "Since there are no guarantees,
877 * it can use a hash filter or silently switch to allmulti or
878 * promiscuous mode if it is given too many addresses.". QEMU marks
879 * `n->mac_table.multi_overflow` if guest sets too many
880 * non-multicast MAC addresses.
882 * Therefore, QEMU should only send this CVQ command if the
883 * `n->mac_table.multi_overflow` is marked or `n->allmulti` is on,
884 * which sets all-multicast mode on, different from the device's defaults.
886 * Note that the device's defaults can mismatch the driver's
887 * configuration only at live migration.
889 if (n
->mac_table
.multi_overflow
|| n
->allmulti
) {
890 dev_written
= vhost_vdpa_net_load_rx_mode(s
,
891 VIRTIO_NET_CTRL_RX_ALLMULTI
, 1);
892 if (unlikely(dev_written
< 0)) {
895 if (*s
->status
!= VIRTIO_NET_OK
) {
900 if (!virtio_vdev_has_feature(&n
->parent_obj
, VIRTIO_NET_F_CTRL_RX_EXTRA
)) {
905 * According to virtio_net_reset(), device turns all-unicast mode
908 * Therefore, QEMU should only send this CVQ command if the driver
909 * sets all-unicast mode on, different from the device's defaults.
911 * Note that the device's defaults can mismatch the driver's
912 * configuration only at live migration.
915 dev_written
= vhost_vdpa_net_load_rx_mode(s
,
916 VIRTIO_NET_CTRL_RX_ALLUNI
, 1);
917 if (dev_written
< 0) {
920 if (*s
->status
!= VIRTIO_NET_OK
) {
926 * According to virtio_net_reset(), device turns non-multicast mode
929 * Therefore, QEMU should only send this CVQ command if the driver
930 * sets non-multicast mode on, different from the device's defaults.
932 * Note that the device's defaults can mismatch the driver's
933 * configuration only at live migration.
936 dev_written
= vhost_vdpa_net_load_rx_mode(s
,
937 VIRTIO_NET_CTRL_RX_NOMULTI
, 1);
938 if (dev_written
< 0) {
941 if (*s
->status
!= VIRTIO_NET_OK
) {
947 * According to virtio_net_reset(), device turns non-unicast mode
950 * Therefore, QEMU should only send this CVQ command if the driver
951 * sets non-unicast mode on, different from the device's defaults.
953 * Note that the device's defaults can mismatch the driver's
954 * configuration only at live migration.
957 dev_written
= vhost_vdpa_net_load_rx_mode(s
,
958 VIRTIO_NET_CTRL_RX_NOUNI
, 1);
959 if (dev_written
< 0) {
962 if (*s
->status
!= VIRTIO_NET_OK
) {
968 * According to virtio_net_reset(), device turns non-broadcast mode
971 * Therefore, QEMU should only send this CVQ command if the driver
972 * sets non-broadcast mode on, different from the device's defaults.
974 * Note that the device's defaults can mismatch the driver's
975 * configuration only at live migration.
978 dev_written
= vhost_vdpa_net_load_rx_mode(s
,
979 VIRTIO_NET_CTRL_RX_NOBCAST
, 1);
980 if (dev_written
< 0) {
983 if (*s
->status
!= VIRTIO_NET_OK
) {
991 static int vhost_vdpa_net_load_single_vlan(VhostVDPAState
*s
,
995 const struct iovec data
= {
997 .iov_len
= sizeof(vid
),
999 ssize_t dev_written
= vhost_vdpa_net_load_cmd(s
, VIRTIO_NET_CTRL_VLAN
,
1000 VIRTIO_NET_CTRL_VLAN_ADD
,
1002 if (unlikely(dev_written
< 0)) {
1005 if (unlikely(*s
->status
!= VIRTIO_NET_OK
)) {
1012 static int vhost_vdpa_net_load_vlan(VhostVDPAState
*s
,
1017 if (!virtio_vdev_has_feature(&n
->parent_obj
, VIRTIO_NET_F_CTRL_VLAN
)) {
1021 for (int i
= 0; i
< MAX_VLAN
>> 5; i
++) {
1022 for (int j
= 0; n
->vlans
[i
] && j
<= 0x1f; j
++) {
1023 if (n
->vlans
[i
] & (1U << j
)) {
1024 r
= vhost_vdpa_net_load_single_vlan(s
, n
, (i
<< 5) + j
);
1025 if (unlikely(r
!= 0)) {
1035 static int vhost_vdpa_net_cvq_load(NetClientState
*nc
)
1037 VhostVDPAState
*s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
1038 struct vhost_vdpa
*v
= &s
->vhost_vdpa
;
1042 assert(nc
->info
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
1044 vhost_vdpa_set_vring_ready(v
, v
->dev
->vq_index
);
1046 if (v
->shadow_vqs_enabled
) {
1047 n
= VIRTIO_NET(v
->dev
->vdev
);
1048 r
= vhost_vdpa_net_load_mac(s
, n
);
1049 if (unlikely(r
< 0)) {
1052 r
= vhost_vdpa_net_load_mq(s
, n
);
1056 r
= vhost_vdpa_net_load_offloads(s
, n
);
1060 r
= vhost_vdpa_net_load_rx(s
, n
);
1064 r
= vhost_vdpa_net_load_vlan(s
, n
);
1070 for (int i
= 0; i
< v
->dev
->vq_index
; ++i
) {
1071 vhost_vdpa_set_vring_ready(v
, i
);
1077 static NetClientInfo net_vhost_vdpa_cvq_info
= {
1078 .type
= NET_CLIENT_DRIVER_VHOST_VDPA
,
1079 .size
= sizeof(VhostVDPAState
),
1080 .receive
= vhost_vdpa_receive
,
1081 .start
= vhost_vdpa_net_cvq_start
,
1082 .load
= vhost_vdpa_net_cvq_load
,
1083 .stop
= vhost_vdpa_net_cvq_stop
,
1084 .cleanup
= vhost_vdpa_cleanup
,
1085 .has_vnet_hdr
= vhost_vdpa_has_vnet_hdr
,
1086 .has_ufo
= vhost_vdpa_has_ufo
,
1087 .check_peer_type
= vhost_vdpa_check_peer_type
,
1091 * Forward the excessive VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command to
1094 * Considering that QEMU cannot send the entire filter table to the
1095 * vdpa device, it should send the VIRTIO_NET_CTRL_RX_PROMISC CVQ
1096 * command to enable promiscuous mode to receive all packets,
1097 * according to VirtIO standard, "Since there are no guarantees,
1098 * it can use a hash filter or silently switch to allmulti or
1099 * promiscuous mode if it is given too many addresses.".
1101 * Since QEMU ignores MAC addresses beyond `MAC_TABLE_ENTRIES` and
1102 * marks `n->mac_table.x_overflow` accordingly, it should have
1103 * the same effect on the device model to receive
1104 * (`MAC_TABLE_ENTRIES` + 1) or more non-multicast MAC addresses.
1105 * The same applies to multicast MAC addresses.
1107 * Therefore, QEMU can provide the device model with a fake
1108 * VIRTIO_NET_CTRL_MAC_TABLE_SET command with (`MAC_TABLE_ENTRIES` + 1)
1109 * non-multicast MAC addresses and (`MAC_TABLE_ENTRIES` + 1) multicast
1110 * MAC addresses. This ensures that the device model marks
1111 * `n->mac_table.uni_overflow` and `n->mac_table.multi_overflow`,
1112 * allowing all packets to be received, which aligns with the
1113 * state of the vdpa device.
1115 static int vhost_vdpa_net_excessive_mac_filter_cvq_add(VhostVDPAState
*s
,
1116 VirtQueueElement
*elem
,
1119 struct virtio_net_ctrl_mac mac_data
, *mac_ptr
;
1120 struct virtio_net_ctrl_hdr
*hdr_ptr
;
1124 /* parse the non-multicast MAC address entries from CVQ command */
1125 cursor
= sizeof(*hdr_ptr
);
1126 r
= iov_to_buf(elem
->out_sg
, elem
->out_num
, cursor
,
1127 &mac_data
, sizeof(mac_data
));
1128 if (unlikely(r
!= sizeof(mac_data
))) {
1130 * If the CVQ command is invalid, we should simulate the vdpa device
1131 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1133 *s
->status
= VIRTIO_NET_ERR
;
1134 return sizeof(*s
->status
);
1136 cursor
+= sizeof(mac_data
) + le32_to_cpu(mac_data
.entries
) * ETH_ALEN
;
1138 /* parse the multicast MAC address entries from CVQ command */
1139 r
= iov_to_buf(elem
->out_sg
, elem
->out_num
, cursor
,
1140 &mac_data
, sizeof(mac_data
));
1141 if (r
!= sizeof(mac_data
)) {
1143 * If the CVQ command is invalid, we should simulate the vdpa device
1144 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1146 *s
->status
= VIRTIO_NET_ERR
;
1147 return sizeof(*s
->status
);
1149 cursor
+= sizeof(mac_data
) + le32_to_cpu(mac_data
.entries
) * ETH_ALEN
;
1151 /* validate the CVQ command */
1152 if (iov_size(elem
->out_sg
, elem
->out_num
) != cursor
) {
1154 * If the CVQ command is invalid, we should simulate the vdpa device
1155 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1157 *s
->status
= VIRTIO_NET_ERR
;
1158 return sizeof(*s
->status
);
1162 * According to VirtIO standard, "Since there are no guarantees,
1163 * it can use a hash filter or silently switch to allmulti or
1164 * promiscuous mode if it is given too many addresses.".
1166 * Therefore, considering that QEMU is unable to send the entire
1167 * filter table to the vdpa device, it should send the
1168 * VIRTIO_NET_CTRL_RX_PROMISC CVQ command to enable promiscuous mode
1170 r
= vhost_vdpa_net_load_rx_mode(s
, VIRTIO_NET_CTRL_RX_PROMISC
, 1);
1171 if (unlikely(r
< 0)) {
1174 if (*s
->status
!= VIRTIO_NET_OK
) {
1175 return sizeof(*s
->status
);
1179 * QEMU should also send a fake VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ
1180 * command to the device model, including (`MAC_TABLE_ENTRIES` + 1)
1181 * non-multicast MAC addresses and (`MAC_TABLE_ENTRIES` + 1)
1182 * multicast MAC addresses.
1184 * By doing so, the device model can mark `n->mac_table.uni_overflow`
1185 * and `n->mac_table.multi_overflow`, enabling all packets to be
1186 * received, which aligns with the state of the vdpa device.
1189 uint32_t fake_uni_entries
= MAC_TABLE_ENTRIES
+ 1,
1190 fake_mul_entries
= MAC_TABLE_ENTRIES
+ 1,
1191 fake_cvq_size
= sizeof(struct virtio_net_ctrl_hdr
) +
1192 sizeof(mac_data
) + fake_uni_entries
* ETH_ALEN
+
1193 sizeof(mac_data
) + fake_mul_entries
* ETH_ALEN
;
1195 assert(fake_cvq_size
< vhost_vdpa_net_cvq_cmd_page_len());
1196 out
->iov_len
= fake_cvq_size
;
1198 /* pack the header for fake CVQ command */
1199 hdr_ptr
= out
->iov_base
+ cursor
;
1200 hdr_ptr
->class = VIRTIO_NET_CTRL_MAC
;
1201 hdr_ptr
->cmd
= VIRTIO_NET_CTRL_MAC_TABLE_SET
;
1202 cursor
+= sizeof(*hdr_ptr
);
1205 * Pack the non-multicast MAC addresses part for fake CVQ command.
1207 * According to virtio_net_handle_mac(), QEMU doesn't verify the MAC
1208 * addresses provided in CVQ command. Therefore, only the entries
1209 * field need to be prepared in the CVQ command.
1211 mac_ptr
= out
->iov_base
+ cursor
;
1212 mac_ptr
->entries
= cpu_to_le32(fake_uni_entries
);
1213 cursor
+= sizeof(*mac_ptr
) + fake_uni_entries
* ETH_ALEN
;
1216 * Pack the multicast MAC addresses part for fake CVQ command.
1218 * According to virtio_net_handle_mac(), QEMU doesn't verify the MAC
1219 * addresses provided in CVQ command. Therefore, only the entries
1220 * field need to be prepared in the CVQ command.
1222 mac_ptr
= out
->iov_base
+ cursor
;
1223 mac_ptr
->entries
= cpu_to_le32(fake_mul_entries
);
1226 * Simulating QEMU poll a vdpa device used buffer
1227 * for VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command
1229 return sizeof(*s
->status
);
1233 * Validate and copy control virtqueue commands.
1235 * Following QEMU guidelines, we offer a copy of the buffers to the device to
1236 * prevent TOCTOU bugs.
1238 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue
*svq
,
1239 VirtQueueElement
*elem
,
1242 VhostVDPAState
*s
= opaque
;
1244 const struct virtio_net_ctrl_hdr
*ctrl
;
1245 virtio_net_ctrl_ack status
= VIRTIO_NET_ERR
;
1246 /* Out buffer sent to both the vdpa device and the device model */
1247 struct iovec out
= {
1248 .iov_base
= s
->cvq_cmd_out_buffer
,
1250 /* in buffer used for device model */
1251 const struct iovec in
= {
1252 .iov_base
= &status
,
1253 .iov_len
= sizeof(status
),
1255 ssize_t dev_written
= -EINVAL
;
1257 out
.iov_len
= iov_to_buf(elem
->out_sg
, elem
->out_num
, 0,
1258 s
->cvq_cmd_out_buffer
,
1259 vhost_vdpa_net_cvq_cmd_page_len());
1261 ctrl
= s
->cvq_cmd_out_buffer
;
1262 if (ctrl
->class == VIRTIO_NET_CTRL_ANNOUNCE
) {
1264 * Guest announce capability is emulated by qemu, so don't forward to
1267 dev_written
= sizeof(status
);
1268 *s
->status
= VIRTIO_NET_OK
;
1269 } else if (unlikely(ctrl
->class == VIRTIO_NET_CTRL_MAC
&&
1270 ctrl
->cmd
== VIRTIO_NET_CTRL_MAC_TABLE_SET
&&
1271 iov_size(elem
->out_sg
, elem
->out_num
) > out
.iov_len
)) {
1273 * Due to the size limitation of the out buffer sent to the vdpa device,
1274 * which is determined by vhost_vdpa_net_cvq_cmd_page_len(), excessive
1275 * MAC addresses set by the driver for the filter table can cause
1276 * truncation of the CVQ command in QEMU. As a result, the vdpa device
1277 * rejects the flawed CVQ command.
1279 * Therefore, QEMU must handle this situation instead of sending
1280 * the CVQ command directly.
1282 dev_written
= vhost_vdpa_net_excessive_mac_filter_cvq_add(s
, elem
,
1284 if (unlikely(dev_written
< 0)) {
1288 dev_written
= vhost_vdpa_net_cvq_add(s
, out
.iov_len
, sizeof(status
));
1289 if (unlikely(dev_written
< 0)) {
1294 if (unlikely(dev_written
< sizeof(status
))) {
1295 error_report("Insufficient written data (%zu)", dev_written
);
1299 if (*s
->status
!= VIRTIO_NET_OK
) {
1303 status
= VIRTIO_NET_ERR
;
1304 virtio_net_handle_ctrl_iov(svq
->vdev
, &in
, 1, &out
, 1);
1305 if (status
!= VIRTIO_NET_OK
) {
1306 error_report("Bad CVQ processing in model");
1310 in_len
= iov_from_buf(elem
->in_sg
, elem
->in_num
, 0, &status
,
1312 if (unlikely(in_len
< sizeof(status
))) {
1313 error_report("Bad device CVQ written length");
1315 vhost_svq_push_elem(svq
, elem
, MIN(in_len
, sizeof(status
)));
1317 * `elem` belongs to vhost_vdpa_net_handle_ctrl_avail() only when
1318 * the function successfully forwards the CVQ command, indicated
1319 * by a non-negative value of `dev_written`. Otherwise, it still
1321 * This function should only free the `elem` when it owns.
1323 if (dev_written
>= 0) {
1326 return dev_written
< 0 ? dev_written
: 0;
1329 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops
= {
1330 .avail_handler
= vhost_vdpa_net_handle_ctrl_avail
,
1334 * Probe if CVQ is isolated
1336 * @device_fd The vdpa device fd
1337 * @features Features offered by the device.
1338 * @cvq_index The control vq pair index
1340 * Returns <0 in case of failure, 0 if false and 1 if true.
1342 static int vhost_vdpa_probe_cvq_isolation(int device_fd
, uint64_t features
,
1343 int cvq_index
, Error
**errp
)
1345 uint64_t backend_features
;
1347 uint8_t status
= VIRTIO_CONFIG_S_ACKNOWLEDGE
|
1348 VIRTIO_CONFIG_S_DRIVER
;
1353 r
= ioctl(device_fd
, VHOST_GET_BACKEND_FEATURES
, &backend_features
);
1354 if (unlikely(r
< 0)) {
1355 error_setg_errno(errp
, errno
, "Cannot get vdpa backend_features");
1359 if (!(backend_features
& BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID
))) {
1363 r
= ioctl(device_fd
, VHOST_VDPA_SET_STATUS
, &status
);
1365 error_setg_errno(errp
, -r
, "Cannot set device status");
1369 r
= ioctl(device_fd
, VHOST_SET_FEATURES
, &features
);
1371 error_setg_errno(errp
, -r
, "Cannot set features");
1375 status
|= VIRTIO_CONFIG_S_FEATURES_OK
;
1376 r
= ioctl(device_fd
, VHOST_VDPA_SET_STATUS
, &status
);
1378 error_setg_errno(errp
, -r
, "Cannot set device status");
1382 cvq_group
= vhost_vdpa_get_vring_group(device_fd
, cvq_index
, errp
);
1383 if (unlikely(cvq_group
< 0)) {
1384 if (cvq_group
!= -ENOTSUP
) {
1390 * The kernel report VHOST_BACKEND_F_IOTLB_ASID if the vdpa frontend
1391 * support ASID even if the parent driver does not. The CVQ cannot be
1392 * isolated in this case.
1400 for (int i
= 0; i
< cvq_index
; ++i
) {
1401 int64_t group
= vhost_vdpa_get_vring_group(device_fd
, i
, errp
);
1402 if (unlikely(group
< 0)) {
1407 if (group
== (int64_t)cvq_group
) {
1417 ioctl(device_fd
, VHOST_VDPA_SET_STATUS
, &status
);
1421 static NetClientState
*net_vhost_vdpa_init(NetClientState
*peer
,
1425 int queue_pair_index
,
1429 struct vhost_vdpa_iova_range iova_range
,
1433 NetClientState
*nc
= NULL
;
1437 int cvq_isolated
= 0;
1440 nc
= qemu_new_net_client(&net_vhost_vdpa_info
, peer
, device
,
1443 cvq_isolated
= vhost_vdpa_probe_cvq_isolation(vdpa_device_fd
, features
,
1444 queue_pair_index
* 2,
1446 if (unlikely(cvq_isolated
< 0)) {
1450 nc
= qemu_new_net_control_client(&net_vhost_vdpa_cvq_info
, peer
,
1453 qemu_set_info_str(nc
, TYPE_VHOST_VDPA
);
1454 s
= DO_UPCAST(VhostVDPAState
, nc
, nc
);
1456 s
->vhost_vdpa
.device_fd
= vdpa_device_fd
;
1457 s
->vhost_vdpa
.index
= queue_pair_index
;
1458 s
->always_svq
= svq
;
1459 s
->migration_state
.notify
= vdpa_net_migration_state_notifier
;
1460 s
->vhost_vdpa
.shadow_vqs_enabled
= svq
;
1461 s
->vhost_vdpa
.iova_range
= iova_range
;
1462 s
->vhost_vdpa
.shadow_data
= svq
;
1463 if (queue_pair_index
== 0) {
1464 vhost_vdpa_net_valid_svq_features(features
,
1465 &s
->vhost_vdpa
.migration_blocker
);
1466 } else if (!is_datapath
) {
1467 s
->cvq_cmd_out_buffer
= mmap(NULL
, vhost_vdpa_net_cvq_cmd_page_len(),
1468 PROT_READ
| PROT_WRITE
,
1469 MAP_SHARED
| MAP_ANONYMOUS
, -1, 0);
1470 s
->status
= mmap(NULL
, vhost_vdpa_net_cvq_cmd_page_len(),
1471 PROT_READ
| PROT_WRITE
, MAP_SHARED
| MAP_ANONYMOUS
,
1474 s
->vhost_vdpa
.shadow_vq_ops
= &vhost_vdpa_net_svq_ops
;
1475 s
->vhost_vdpa
.shadow_vq_ops_opaque
= s
;
1476 s
->cvq_isolated
= cvq_isolated
;
1478 ret
= vhost_vdpa_add(nc
, (void *)&s
->vhost_vdpa
, queue_pair_index
, nvqs
);
1480 qemu_del_net_client(nc
);
1486 static int vhost_vdpa_get_features(int fd
, uint64_t *features
, Error
**errp
)
1488 int ret
= ioctl(fd
, VHOST_GET_FEATURES
, features
);
1489 if (unlikely(ret
< 0)) {
1490 error_setg_errno(errp
, errno
,
1491 "Fail to query features from vhost-vDPA device");
1496 static int vhost_vdpa_get_max_queue_pairs(int fd
, uint64_t features
,
1497 int *has_cvq
, Error
**errp
)
1499 unsigned long config_size
= offsetof(struct vhost_vdpa_config
, buf
);
1500 g_autofree
struct vhost_vdpa_config
*config
= NULL
;
1501 __virtio16
*max_queue_pairs
;
1504 if (features
& (1 << VIRTIO_NET_F_CTRL_VQ
)) {
1510 if (features
& (1 << VIRTIO_NET_F_MQ
)) {
1511 config
= g_malloc0(config_size
+ sizeof(*max_queue_pairs
));
1512 config
->off
= offsetof(struct virtio_net_config
, max_virtqueue_pairs
);
1513 config
->len
= sizeof(*max_queue_pairs
);
1515 ret
= ioctl(fd
, VHOST_VDPA_GET_CONFIG
, config
);
1517 error_setg(errp
, "Fail to get config from vhost-vDPA device");
1521 max_queue_pairs
= (__virtio16
*)&config
->buf
;
1523 return lduw_le_p(max_queue_pairs
);
1529 int net_init_vhost_vdpa(const Netdev
*netdev
, const char *name
,
1530 NetClientState
*peer
, Error
**errp
)
1532 const NetdevVhostVDPAOptions
*opts
;
1535 g_autofree NetClientState
**ncs
= NULL
;
1536 struct vhost_vdpa_iova_range iova_range
;
1538 int queue_pairs
, r
, i
= 0, has_cvq
= 0;
1540 assert(netdev
->type
== NET_CLIENT_DRIVER_VHOST_VDPA
);
1541 opts
= &netdev
->u
.vhost_vdpa
;
1542 if (!opts
->vhostdev
&& !opts
->vhostfd
) {
1544 "vhost-vdpa: neither vhostdev= nor vhostfd= was specified");
1548 if (opts
->vhostdev
&& opts
->vhostfd
) {
1550 "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive");
1554 if (opts
->vhostdev
) {
1555 vdpa_device_fd
= qemu_open(opts
->vhostdev
, O_RDWR
, errp
);
1556 if (vdpa_device_fd
== -1) {
1561 vdpa_device_fd
= monitor_fd_param(monitor_cur(), opts
->vhostfd
, errp
);
1562 if (vdpa_device_fd
== -1) {
1563 error_prepend(errp
, "vhost-vdpa: unable to parse vhostfd: ");
1568 r
= vhost_vdpa_get_features(vdpa_device_fd
, &features
, errp
);
1569 if (unlikely(r
< 0)) {
1573 queue_pairs
= vhost_vdpa_get_max_queue_pairs(vdpa_device_fd
, features
,
1575 if (queue_pairs
< 0) {
1576 qemu_close(vdpa_device_fd
);
1580 r
= vhost_vdpa_get_iova_range(vdpa_device_fd
, &iova_range
);
1581 if (unlikely(r
< 0)) {
1582 error_setg(errp
, "vhost-vdpa: get iova range failed: %s",
1587 if (opts
->x_svq
&& !vhost_vdpa_net_valid_svq_features(features
, errp
)) {
1591 ncs
= g_malloc0(sizeof(*ncs
) * queue_pairs
);
1593 for (i
= 0; i
< queue_pairs
; i
++) {
1594 ncs
[i
] = net_vhost_vdpa_init(peer
, TYPE_VHOST_VDPA
, name
,
1595 vdpa_device_fd
, i
, 2, true, opts
->x_svq
,
1596 iova_range
, features
, errp
);
1602 nc
= net_vhost_vdpa_init(peer
, TYPE_VHOST_VDPA
, name
,
1603 vdpa_device_fd
, i
, 1, false,
1604 opts
->x_svq
, iova_range
, features
, errp
);
1613 for (i
--; i
>= 0; i
--) {
1614 qemu_del_net_client(ncs
[i
]);
1618 qemu_close(vdpa_device_fd
);