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Commit | Line | Data |
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1e0a84ea CL |
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" | |
bd907ae4 | 14 | #include "hw/virtio/virtio-net.h" |
1e0a84ea CL |
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" | |
bd907ae4 EP |
20 | #include "qemu/log.h" |
21 | #include "qemu/memalign.h" | |
1e0a84ea CL |
22 | #include "qemu/option.h" |
23 | #include "qapi/error.h" | |
40237840 | 24 | #include <linux/vhost.h> |
1e0a84ea CL |
25 | #include <sys/ioctl.h> |
26 | #include <err.h> | |
27 | #include "standard-headers/linux/virtio_net.h" | |
28 | #include "monitor/monitor.h" | |
29 | #include "hw/virtio/vhost.h" | |
30 | ||
31 | /* Todo:need to add the multiqueue support here */ | |
32 | typedef struct VhostVDPAState { | |
33 | NetClientState nc; | |
34 | struct vhost_vdpa vhost_vdpa; | |
35 | VHostNetState *vhost_net; | |
2df4dd31 EP |
36 | |
37 | /* Control commands shadow buffers */ | |
17fb889f EP |
38 | void *cvq_cmd_out_buffer; |
39 | virtio_net_ctrl_ack *status; | |
40 | ||
7f211a28 EP |
41 | /* The device always have SVQ enabled */ |
42 | bool always_svq; | |
1e0a84ea CL |
43 | bool started; |
44 | } VhostVDPAState; | |
45 | ||
46 | const int vdpa_feature_bits[] = { | |
47 | VIRTIO_F_NOTIFY_ON_EMPTY, | |
48 | VIRTIO_RING_F_INDIRECT_DESC, | |
49 | VIRTIO_RING_F_EVENT_IDX, | |
50 | VIRTIO_F_ANY_LAYOUT, | |
51 | VIRTIO_F_VERSION_1, | |
52 | VIRTIO_NET_F_CSUM, | |
53 | VIRTIO_NET_F_GUEST_CSUM, | |
54 | VIRTIO_NET_F_GSO, | |
55 | VIRTIO_NET_F_GUEST_TSO4, | |
56 | VIRTIO_NET_F_GUEST_TSO6, | |
57 | VIRTIO_NET_F_GUEST_ECN, | |
58 | VIRTIO_NET_F_GUEST_UFO, | |
59 | VIRTIO_NET_F_HOST_TSO4, | |
60 | VIRTIO_NET_F_HOST_TSO6, | |
61 | VIRTIO_NET_F_HOST_ECN, | |
62 | VIRTIO_NET_F_HOST_UFO, | |
63 | VIRTIO_NET_F_MRG_RXBUF, | |
64 | VIRTIO_NET_F_MTU, | |
40237840 JW |
65 | VIRTIO_NET_F_CTRL_RX, |
66 | VIRTIO_NET_F_CTRL_RX_EXTRA, | |
67 | VIRTIO_NET_F_CTRL_VLAN, | |
40237840 JW |
68 | VIRTIO_NET_F_CTRL_MAC_ADDR, |
69 | VIRTIO_NET_F_RSS, | |
70 | VIRTIO_NET_F_MQ, | |
71 | VIRTIO_NET_F_CTRL_VQ, | |
1e0a84ea CL |
72 | VIRTIO_F_IOMMU_PLATFORM, |
73 | VIRTIO_F_RING_PACKED, | |
562a7d23 | 74 | VIRTIO_F_RING_RESET, |
0145c393 AM |
75 | VIRTIO_NET_F_RSS, |
76 | VIRTIO_NET_F_HASH_REPORT, | |
9aa47edd | 77 | VIRTIO_NET_F_STATUS, |
1e0a84ea CL |
78 | VHOST_INVALID_FEATURE_BIT |
79 | }; | |
80 | ||
1576dbb5 EP |
81 | /** Supported device specific feature bits with SVQ */ |
82 | static const uint64_t vdpa_svq_device_features = | |
83 | BIT_ULL(VIRTIO_NET_F_CSUM) | | |
84 | BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) | | |
85 | BIT_ULL(VIRTIO_NET_F_MTU) | | |
86 | BIT_ULL(VIRTIO_NET_F_MAC) | | |
87 | BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) | | |
88 | BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) | | |
89 | BIT_ULL(VIRTIO_NET_F_GUEST_ECN) | | |
90 | BIT_ULL(VIRTIO_NET_F_GUEST_UFO) | | |
91 | BIT_ULL(VIRTIO_NET_F_HOST_TSO4) | | |
92 | BIT_ULL(VIRTIO_NET_F_HOST_TSO6) | | |
93 | BIT_ULL(VIRTIO_NET_F_HOST_ECN) | | |
94 | BIT_ULL(VIRTIO_NET_F_HOST_UFO) | | |
95 | BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) | | |
96 | BIT_ULL(VIRTIO_NET_F_STATUS) | | |
97 | BIT_ULL(VIRTIO_NET_F_CTRL_VQ) | | |
72b99a87 | 98 | BIT_ULL(VIRTIO_NET_F_MQ) | |
1576dbb5 EP |
99 | BIT_ULL(VIRTIO_F_ANY_LAYOUT) | |
100 | BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) | | |
101 | BIT_ULL(VIRTIO_NET_F_RSC_EXT) | | |
102 | BIT_ULL(VIRTIO_NET_F_STANDBY); | |
103 | ||
c1a10086 EP |
104 | #define VHOST_VDPA_NET_CVQ_ASID 1 |
105 | ||
1e0a84ea CL |
106 | VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) |
107 | { | |
108 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
109 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
110 | return s->vhost_net; | |
111 | } | |
112 | ||
36e46472 EP |
113 | static bool vhost_vdpa_net_valid_svq_features(uint64_t features, Error **errp) |
114 | { | |
115 | uint64_t invalid_dev_features = | |
116 | features & ~vdpa_svq_device_features & | |
117 | /* Transport are all accepted at this point */ | |
118 | ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, | |
119 | VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); | |
120 | ||
121 | if (invalid_dev_features) { | |
122 | error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, | |
123 | invalid_dev_features); | |
258a0394 | 124 | return false; |
36e46472 EP |
125 | } |
126 | ||
258a0394 | 127 | return vhost_svq_valid_features(features, errp); |
36e46472 EP |
128 | } |
129 | ||
1e0a84ea CL |
130 | static int vhost_vdpa_net_check_device_id(struct vhost_net *net) |
131 | { | |
132 | uint32_t device_id; | |
133 | int ret; | |
134 | struct vhost_dev *hdev; | |
135 | ||
136 | hdev = (struct vhost_dev *)&net->dev; | |
137 | ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); | |
138 | if (device_id != VIRTIO_ID_NET) { | |
139 | return -ENOTSUP; | |
140 | } | |
141 | return ret; | |
142 | } | |
143 | ||
40237840 JW |
144 | static int vhost_vdpa_add(NetClientState *ncs, void *be, |
145 | int queue_pair_index, int nvqs) | |
1e0a84ea CL |
146 | { |
147 | VhostNetOptions options; | |
148 | struct vhost_net *net = NULL; | |
149 | VhostVDPAState *s; | |
150 | int ret; | |
151 | ||
152 | options.backend_type = VHOST_BACKEND_TYPE_VDPA; | |
153 | assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
154 | s = DO_UPCAST(VhostVDPAState, nc, ncs); | |
155 | options.net_backend = ncs; | |
156 | options.opaque = be; | |
157 | options.busyloop_timeout = 0; | |
40237840 | 158 | options.nvqs = nvqs; |
1e0a84ea CL |
159 | |
160 | net = vhost_net_init(&options); | |
161 | if (!net) { | |
162 | error_report("failed to init vhost_net for queue"); | |
a97ef87a | 163 | goto err_init; |
1e0a84ea | 164 | } |
1e0a84ea CL |
165 | s->vhost_net = net; |
166 | ret = vhost_vdpa_net_check_device_id(net); | |
167 | if (ret) { | |
a97ef87a | 168 | goto err_check; |
1e0a84ea CL |
169 | } |
170 | return 0; | |
a97ef87a JW |
171 | err_check: |
172 | vhost_net_cleanup(net); | |
173 | g_free(net); | |
174 | err_init: | |
1e0a84ea CL |
175 | return -1; |
176 | } | |
177 | ||
178 | static void vhost_vdpa_cleanup(NetClientState *nc) | |
179 | { | |
180 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
1576dbb5 | 181 | struct vhost_dev *dev = &s->vhost_net->dev; |
1e0a84ea | 182 | |
2df4dd31 | 183 | qemu_vfree(s->cvq_cmd_out_buffer); |
17fb889f | 184 | qemu_vfree(s->status); |
1576dbb5 EP |
185 | if (dev->vq_index + dev->nvqs == dev->vq_index_end) { |
186 | g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); | |
187 | } | |
1e0a84ea CL |
188 | if (s->vhost_net) { |
189 | vhost_net_cleanup(s->vhost_net); | |
190 | g_free(s->vhost_net); | |
191 | s->vhost_net = NULL; | |
192 | } | |
57b3a7d8 CL |
193 | if (s->vhost_vdpa.device_fd >= 0) { |
194 | qemu_close(s->vhost_vdpa.device_fd); | |
195 | s->vhost_vdpa.device_fd = -1; | |
196 | } | |
1e0a84ea CL |
197 | } |
198 | ||
199 | static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) | |
200 | { | |
201 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
202 | ||
203 | return true; | |
204 | } | |
205 | ||
206 | static bool vhost_vdpa_has_ufo(NetClientState *nc) | |
207 | { | |
208 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
209 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
210 | uint64_t features = 0; | |
211 | features |= (1ULL << VIRTIO_NET_F_HOST_UFO); | |
212 | features = vhost_net_get_features(s->vhost_net, features); | |
213 | return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); | |
214 | ||
215 | } | |
216 | ||
ee8a1c63 KW |
217 | static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, |
218 | Error **errp) | |
219 | { | |
220 | const char *driver = object_class_get_name(oc); | |
221 | ||
222 | if (!g_str_has_prefix(driver, "virtio-net-")) { | |
223 | error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); | |
224 | return false; | |
225 | } | |
226 | ||
227 | return true; | |
228 | } | |
229 | ||
846a1e85 EP |
230 | /** Dummy receive in case qemu falls back to userland tap networking */ |
231 | static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, | |
232 | size_t size) | |
233 | { | |
bc5add1d | 234 | return size; |
846a1e85 EP |
235 | } |
236 | ||
1e0a84ea CL |
237 | static NetClientInfo net_vhost_vdpa_info = { |
238 | .type = NET_CLIENT_DRIVER_VHOST_VDPA, | |
239 | .size = sizeof(VhostVDPAState), | |
846a1e85 | 240 | .receive = vhost_vdpa_receive, |
1e0a84ea CL |
241 | .cleanup = vhost_vdpa_cleanup, |
242 | .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, | |
243 | .has_ufo = vhost_vdpa_has_ufo, | |
ee8a1c63 | 244 | .check_peer_type = vhost_vdpa_check_peer_type, |
1e0a84ea CL |
245 | }; |
246 | ||
c1a10086 EP |
247 | static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index) |
248 | { | |
249 | struct vhost_vring_state state = { | |
250 | .index = vq_index, | |
251 | }; | |
252 | int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, &state); | |
253 | ||
254 | if (unlikely(r < 0)) { | |
255 | error_report("Cannot get VQ %u group: %s", vq_index, | |
256 | g_strerror(errno)); | |
257 | return r; | |
258 | } | |
259 | ||
260 | return state.num; | |
261 | } | |
262 | ||
263 | static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v, | |
264 | unsigned vq_group, | |
265 | unsigned asid_num) | |
266 | { | |
267 | struct vhost_vring_state asid = { | |
268 | .index = vq_group, | |
269 | .num = asid_num, | |
270 | }; | |
271 | int r; | |
272 | ||
273 | r = ioctl(v->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid); | |
274 | if (unlikely(r < 0)) { | |
275 | error_report("Can't set vq group %u asid %u, errno=%d (%s)", | |
276 | asid.index, asid.num, errno, g_strerror(errno)); | |
277 | } | |
278 | return r; | |
279 | } | |
280 | ||
2df4dd31 EP |
281 | static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) |
282 | { | |
283 | VhostIOVATree *tree = v->iova_tree; | |
284 | DMAMap needle = { | |
285 | /* | |
286 | * No need to specify size or to look for more translations since | |
287 | * this contiguous chunk was allocated by us. | |
288 | */ | |
289 | .translated_addr = (hwaddr)(uintptr_t)addr, | |
290 | }; | |
291 | const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); | |
292 | int r; | |
293 | ||
294 | if (unlikely(!map)) { | |
295 | error_report("Cannot locate expected map"); | |
296 | return; | |
297 | } | |
298 | ||
cd831ed5 | 299 | r = vhost_vdpa_dma_unmap(v, v->address_space_id, map->iova, map->size + 1); |
2df4dd31 EP |
300 | if (unlikely(r != 0)) { |
301 | error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); | |
302 | } | |
303 | ||
69292a8e | 304 | vhost_iova_tree_remove(tree, *map); |
2df4dd31 EP |
305 | } |
306 | ||
307 | static size_t vhost_vdpa_net_cvq_cmd_len(void) | |
308 | { | |
309 | /* | |
310 | * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. | |
311 | * In buffer is always 1 byte, so it should fit here | |
312 | */ | |
313 | return sizeof(struct virtio_net_ctrl_hdr) + | |
314 | 2 * sizeof(struct virtio_net_ctrl_mac) + | |
315 | MAC_TABLE_ENTRIES * ETH_ALEN; | |
316 | } | |
317 | ||
318 | static size_t vhost_vdpa_net_cvq_cmd_page_len(void) | |
319 | { | |
320 | return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); | |
321 | } | |
322 | ||
7a7f87e9 EP |
323 | /** Map CVQ buffer. */ |
324 | static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, | |
325 | bool write) | |
2df4dd31 EP |
326 | { |
327 | DMAMap map = {}; | |
328 | int r; | |
329 | ||
2df4dd31 | 330 | map.translated_addr = (hwaddr)(uintptr_t)buf; |
7a7f87e9 | 331 | map.size = size - 1; |
2df4dd31 EP |
332 | map.perm = write ? IOMMU_RW : IOMMU_RO, |
333 | r = vhost_iova_tree_map_alloc(v->iova_tree, &map); | |
334 | if (unlikely(r != IOVA_OK)) { | |
335 | error_report("Cannot map injected element"); | |
7a7f87e9 | 336 | return r; |
2df4dd31 EP |
337 | } |
338 | ||
cd831ed5 EP |
339 | r = vhost_vdpa_dma_map(v, v->address_space_id, map.iova, |
340 | vhost_vdpa_net_cvq_cmd_page_len(), buf, !write); | |
2df4dd31 EP |
341 | if (unlikely(r < 0)) { |
342 | goto dma_map_err; | |
343 | } | |
344 | ||
7a7f87e9 | 345 | return 0; |
2df4dd31 EP |
346 | |
347 | dma_map_err: | |
69292a8e | 348 | vhost_iova_tree_remove(v->iova_tree, map); |
7a7f87e9 | 349 | return r; |
2df4dd31 EP |
350 | } |
351 | ||
7a7f87e9 | 352 | static int vhost_vdpa_net_cvq_start(NetClientState *nc) |
2df4dd31 | 353 | { |
7a7f87e9 | 354 | VhostVDPAState *s; |
c1a10086 EP |
355 | struct vhost_vdpa *v; |
356 | uint64_t backend_features; | |
357 | int64_t cvq_group; | |
358 | int cvq_index, r; | |
2df4dd31 | 359 | |
7a7f87e9 EP |
360 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); |
361 | ||
362 | s = DO_UPCAST(VhostVDPAState, nc, nc); | |
c1a10086 EP |
363 | v = &s->vhost_vdpa; |
364 | ||
365 | v->shadow_data = s->always_svq; | |
366 | v->shadow_vqs_enabled = s->always_svq; | |
367 | s->vhost_vdpa.address_space_id = VHOST_VDPA_GUEST_PA_ASID; | |
368 | ||
369 | if (s->always_svq) { | |
370 | /* SVQ is already configured for all virtqueues */ | |
371 | goto out; | |
372 | } | |
373 | ||
374 | /* | |
375 | * If we early return in these cases SVQ will not be enabled. The migration | |
376 | * will be blocked as long as vhost-vdpa backends will not offer _F_LOG. | |
377 | * | |
378 | * Calling VHOST_GET_BACKEND_FEATURES as they are not available in v->dev | |
379 | * yet. | |
380 | */ | |
381 | r = ioctl(v->device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features); | |
382 | if (unlikely(r < 0)) { | |
383 | error_report("Cannot get vdpa backend_features: %s(%d)", | |
384 | g_strerror(errno), errno); | |
385 | return -1; | |
386 | } | |
387 | if (!(backend_features & VHOST_BACKEND_F_IOTLB_ASID) || | |
388 | !vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) { | |
389 | return 0; | |
390 | } | |
391 | ||
392 | /* | |
393 | * Check if all the virtqueues of the virtio device are in a different vq | |
394 | * than the last vq. VQ group of last group passed in cvq_group. | |
395 | */ | |
396 | cvq_index = v->dev->vq_index_end - 1; | |
397 | cvq_group = vhost_vdpa_get_vring_group(v->device_fd, cvq_index); | |
398 | if (unlikely(cvq_group < 0)) { | |
399 | return cvq_group; | |
400 | } | |
401 | for (int i = 0; i < cvq_index; ++i) { | |
402 | int64_t group = vhost_vdpa_get_vring_group(v->device_fd, i); | |
403 | ||
404 | if (unlikely(group < 0)) { | |
405 | return group; | |
406 | } | |
407 | ||
408 | if (group == cvq_group) { | |
409 | return 0; | |
410 | } | |
411 | } | |
412 | ||
413 | r = vhost_vdpa_set_address_space_id(v, cvq_group, VHOST_VDPA_NET_CVQ_ASID); | |
414 | if (unlikely(r < 0)) { | |
415 | return r; | |
416 | } | |
417 | ||
418 | v->iova_tree = vhost_iova_tree_new(v->iova_range.first, | |
419 | v->iova_range.last); | |
420 | v->shadow_vqs_enabled = true; | |
421 | s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_ASID; | |
422 | ||
423 | out: | |
7a7f87e9 EP |
424 | if (!s->vhost_vdpa.shadow_vqs_enabled) { |
425 | return 0; | |
2df4dd31 EP |
426 | } |
427 | ||
7a7f87e9 EP |
428 | r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, |
429 | vhost_vdpa_net_cvq_cmd_page_len(), false); | |
430 | if (unlikely(r < 0)) { | |
431 | return r; | |
432 | } | |
433 | ||
17fb889f | 434 | r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status, |
7a7f87e9 EP |
435 | vhost_vdpa_net_cvq_cmd_page_len(), true); |
436 | if (unlikely(r < 0)) { | |
2df4dd31 | 437 | vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); |
2df4dd31 EP |
438 | } |
439 | ||
7a7f87e9 EP |
440 | return r; |
441 | } | |
442 | ||
443 | static void vhost_vdpa_net_cvq_stop(NetClientState *nc) | |
444 | { | |
445 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
446 | ||
447 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
448 | ||
449 | if (s->vhost_vdpa.shadow_vqs_enabled) { | |
450 | vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); | |
17fb889f | 451 | vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status); |
c1a10086 EP |
452 | if (!s->always_svq) { |
453 | /* | |
454 | * If only the CVQ is shadowed we can delete this safely. | |
455 | * If all the VQs are shadows this will be needed by the time the | |
456 | * device is started again to register SVQ vrings and similar. | |
457 | */ | |
458 | g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); | |
459 | } | |
7a7f87e9 | 460 | } |
2df4dd31 EP |
461 | } |
462 | ||
be4278b6 EP |
463 | static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, |
464 | size_t in_len) | |
465 | { | |
466 | /* Buffers for the device */ | |
467 | const struct iovec out = { | |
468 | .iov_base = s->cvq_cmd_out_buffer, | |
469 | .iov_len = out_len, | |
470 | }; | |
471 | const struct iovec in = { | |
17fb889f | 472 | .iov_base = s->status, |
be4278b6 EP |
473 | .iov_len = sizeof(virtio_net_ctrl_ack), |
474 | }; | |
475 | VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); | |
476 | int r; | |
477 | ||
478 | r = vhost_svq_add(svq, &out, 1, &in, 1, NULL); | |
479 | if (unlikely(r != 0)) { | |
480 | if (unlikely(r == -ENOSPC)) { | |
481 | qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", | |
482 | __func__); | |
483 | } | |
484 | return r; | |
485 | } | |
486 | ||
487 | /* | |
488 | * We can poll here since we've had BQL from the time we sent the | |
489 | * descriptor. Also, we need to take the answer before SVQ pulls by itself, | |
490 | * when BQL is released | |
491 | */ | |
492 | return vhost_svq_poll(svq); | |
493 | } | |
494 | ||
f73c0c43 EP |
495 | static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class, |
496 | uint8_t cmd, const void *data, | |
497 | size_t data_size) | |
498 | { | |
499 | const struct virtio_net_ctrl_hdr ctrl = { | |
500 | .class = class, | |
501 | .cmd = cmd, | |
502 | }; | |
503 | ||
504 | assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl)); | |
505 | ||
506 | memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl)); | |
507 | memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size); | |
508 | ||
509 | return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size, | |
510 | sizeof(virtio_net_ctrl_ack)); | |
511 | } | |
512 | ||
513 | static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n) | |
514 | { | |
515 | uint64_t features = n->parent_obj.guest_features; | |
516 | if (features & BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR)) { | |
517 | ssize_t dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MAC, | |
518 | VIRTIO_NET_CTRL_MAC_ADDR_SET, | |
519 | n->mac, sizeof(n->mac)); | |
520 | if (unlikely(dev_written < 0)) { | |
521 | return dev_written; | |
522 | } | |
523 | ||
524 | return *s->status != VIRTIO_NET_OK; | |
525 | } | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
f64c7cda EP |
530 | static int vhost_vdpa_net_load_mq(VhostVDPAState *s, |
531 | const VirtIONet *n) | |
532 | { | |
533 | struct virtio_net_ctrl_mq mq; | |
534 | uint64_t features = n->parent_obj.guest_features; | |
535 | ssize_t dev_written; | |
536 | ||
537 | if (!(features & BIT_ULL(VIRTIO_NET_F_MQ))) { | |
538 | return 0; | |
539 | } | |
540 | ||
541 | mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs); | |
542 | dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MQ, | |
543 | VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &mq, | |
544 | sizeof(mq)); | |
545 | if (unlikely(dev_written < 0)) { | |
546 | return dev_written; | |
547 | } | |
548 | ||
549 | return *s->status != VIRTIO_NET_OK; | |
550 | } | |
551 | ||
dd036d8d EP |
552 | static int vhost_vdpa_net_load(NetClientState *nc) |
553 | { | |
554 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
f73c0c43 | 555 | struct vhost_vdpa *v = &s->vhost_vdpa; |
dd036d8d | 556 | const VirtIONet *n; |
f73c0c43 | 557 | int r; |
dd036d8d EP |
558 | |
559 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
560 | ||
561 | if (!v->shadow_vqs_enabled) { | |
562 | return 0; | |
563 | } | |
564 | ||
565 | n = VIRTIO_NET(v->dev->vdev); | |
f73c0c43 EP |
566 | r = vhost_vdpa_net_load_mac(s, n); |
567 | if (unlikely(r < 0)) { | |
568 | return r; | |
dd036d8d | 569 | } |
f64c7cda EP |
570 | r = vhost_vdpa_net_load_mq(s, n); |
571 | if (unlikely(r)) { | |
572 | return r; | |
573 | } | |
dd036d8d EP |
574 | |
575 | return 0; | |
576 | } | |
577 | ||
f8972b56 EP |
578 | static NetClientInfo net_vhost_vdpa_cvq_info = { |
579 | .type = NET_CLIENT_DRIVER_VHOST_VDPA, | |
580 | .size = sizeof(VhostVDPAState), | |
581 | .receive = vhost_vdpa_receive, | |
7a7f87e9 | 582 | .start = vhost_vdpa_net_cvq_start, |
dd036d8d | 583 | .load = vhost_vdpa_net_load, |
7a7f87e9 | 584 | .stop = vhost_vdpa_net_cvq_stop, |
f8972b56 EP |
585 | .cleanup = vhost_vdpa_cleanup, |
586 | .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, | |
587 | .has_ufo = vhost_vdpa_has_ufo, | |
588 | .check_peer_type = vhost_vdpa_check_peer_type, | |
589 | }; | |
590 | ||
2df4dd31 EP |
591 | /** |
592 | * Validate and copy control virtqueue commands. | |
593 | * | |
594 | * Following QEMU guidelines, we offer a copy of the buffers to the device to | |
595 | * prevent TOCTOU bugs. | |
bd907ae4 EP |
596 | */ |
597 | static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, | |
598 | VirtQueueElement *elem, | |
599 | void *opaque) | |
600 | { | |
2df4dd31 | 601 | VhostVDPAState *s = opaque; |
be4278b6 | 602 | size_t in_len; |
bd907ae4 | 603 | virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
7a7f87e9 EP |
604 | /* Out buffer sent to both the vdpa device and the device model */ |
605 | struct iovec out = { | |
606 | .iov_base = s->cvq_cmd_out_buffer, | |
607 | }; | |
2df4dd31 EP |
608 | /* in buffer used for device model */ |
609 | const struct iovec in = { | |
610 | .iov_base = &status, | |
611 | .iov_len = sizeof(status), | |
612 | }; | |
be4278b6 | 613 | ssize_t dev_written = -EINVAL; |
2df4dd31 | 614 | |
7a7f87e9 EP |
615 | out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, |
616 | s->cvq_cmd_out_buffer, | |
617 | vhost_vdpa_net_cvq_cmd_len()); | |
3f9a3eeb EP |
618 | if (*(uint8_t *)s->cvq_cmd_out_buffer == VIRTIO_NET_CTRL_ANNOUNCE) { |
619 | /* | |
620 | * Guest announce capability is emulated by qemu, so don't forward to | |
621 | * the device. | |
622 | */ | |
623 | dev_written = sizeof(status); | |
624 | *s->status = VIRTIO_NET_OK; | |
625 | } else { | |
626 | dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); | |
627 | if (unlikely(dev_written < 0)) { | |
628 | goto out; | |
629 | } | |
bd907ae4 EP |
630 | } |
631 | ||
bd907ae4 EP |
632 | if (unlikely(dev_written < sizeof(status))) { |
633 | error_report("Insufficient written data (%zu)", dev_written); | |
2df4dd31 EP |
634 | goto out; |
635 | } | |
636 | ||
17fb889f | 637 | if (*s->status != VIRTIO_NET_OK) { |
be4278b6 | 638 | return VIRTIO_NET_ERR; |
2df4dd31 EP |
639 | } |
640 | ||
641 | status = VIRTIO_NET_ERR; | |
7a7f87e9 | 642 | virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1); |
2df4dd31 EP |
643 | if (status != VIRTIO_NET_OK) { |
644 | error_report("Bad CVQ processing in model"); | |
bd907ae4 EP |
645 | } |
646 | ||
647 | out: | |
648 | in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, | |
649 | sizeof(status)); | |
650 | if (unlikely(in_len < sizeof(status))) { | |
651 | error_report("Bad device CVQ written length"); | |
652 | } | |
653 | vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); | |
654 | g_free(elem); | |
be4278b6 | 655 | return dev_written < 0 ? dev_written : 0; |
bd907ae4 EP |
656 | } |
657 | ||
658 | static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { | |
659 | .avail_handler = vhost_vdpa_net_handle_ctrl_avail, | |
660 | }; | |
661 | ||
654790b6 | 662 | static NetClientState *net_vhost_vdpa_init(NetClientState *peer, |
a585fad2 EP |
663 | const char *device, |
664 | const char *name, | |
665 | int vdpa_device_fd, | |
666 | int queue_pair_index, | |
667 | int nvqs, | |
668 | bool is_datapath, | |
669 | bool svq, | |
670 | struct vhost_vdpa_iova_range iova_range, | |
671 | VhostIOVATree *iova_tree) | |
1e0a84ea CL |
672 | { |
673 | NetClientState *nc = NULL; | |
674 | VhostVDPAState *s; | |
1e0a84ea CL |
675 | int ret = 0; |
676 | assert(name); | |
40237840 JW |
677 | if (is_datapath) { |
678 | nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, | |
679 | name); | |
680 | } else { | |
f8972b56 | 681 | nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, |
40237840 JW |
682 | device, name); |
683 | } | |
53b85d95 | 684 | qemu_set_info_str(nc, TYPE_VHOST_VDPA); |
1e0a84ea | 685 | s = DO_UPCAST(VhostVDPAState, nc, nc); |
7327813d | 686 | |
1e0a84ea | 687 | s->vhost_vdpa.device_fd = vdpa_device_fd; |
40237840 | 688 | s->vhost_vdpa.index = queue_pair_index; |
7f211a28 | 689 | s->always_svq = svq; |
1576dbb5 | 690 | s->vhost_vdpa.shadow_vqs_enabled = svq; |
a585fad2 | 691 | s->vhost_vdpa.iova_range = iova_range; |
6188d78a | 692 | s->vhost_vdpa.shadow_data = svq; |
1576dbb5 | 693 | s->vhost_vdpa.iova_tree = iova_tree; |
bd907ae4 | 694 | if (!is_datapath) { |
2df4dd31 EP |
695 | s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size(), |
696 | vhost_vdpa_net_cvq_cmd_page_len()); | |
697 | memset(s->cvq_cmd_out_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len()); | |
17fb889f EP |
698 | s->status = qemu_memalign(qemu_real_host_page_size(), |
699 | vhost_vdpa_net_cvq_cmd_page_len()); | |
700 | memset(s->status, 0, vhost_vdpa_net_cvq_cmd_page_len()); | |
2df4dd31 | 701 | |
bd907ae4 EP |
702 | s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; |
703 | s->vhost_vdpa.shadow_vq_ops_opaque = s; | |
704 | } | |
40237840 | 705 | ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); |
74af5eec | 706 | if (ret) { |
74af5eec | 707 | qemu_del_net_client(nc); |
654790b6 | 708 | return NULL; |
74af5eec | 709 | } |
654790b6 | 710 | return nc; |
1e0a84ea CL |
711 | } |
712 | ||
8170ab3f EP |
713 | static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) |
714 | { | |
715 | int ret = ioctl(fd, VHOST_GET_FEATURES, features); | |
716 | if (unlikely(ret < 0)) { | |
717 | error_setg_errno(errp, errno, | |
718 | "Fail to query features from vhost-vDPA device"); | |
719 | } | |
720 | return ret; | |
721 | } | |
722 | ||
723 | static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, | |
724 | int *has_cvq, Error **errp) | |
40237840 JW |
725 | { |
726 | unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); | |
cd523a41 | 727 | g_autofree struct vhost_vdpa_config *config = NULL; |
40237840 | 728 | __virtio16 *max_queue_pairs; |
40237840 JW |
729 | int ret; |
730 | ||
40237840 JW |
731 | if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { |
732 | *has_cvq = 1; | |
733 | } else { | |
734 | *has_cvq = 0; | |
735 | } | |
736 | ||
737 | if (features & (1 << VIRTIO_NET_F_MQ)) { | |
738 | config = g_malloc0(config_size + sizeof(*max_queue_pairs)); | |
739 | config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); | |
740 | config->len = sizeof(*max_queue_pairs); | |
741 | ||
742 | ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); | |
743 | if (ret) { | |
744 | error_setg(errp, "Fail to get config from vhost-vDPA device"); | |
745 | return -ret; | |
746 | } | |
747 | ||
748 | max_queue_pairs = (__virtio16 *)&config->buf; | |
749 | ||
750 | return lduw_le_p(max_queue_pairs); | |
751 | } | |
752 | ||
753 | return 1; | |
754 | } | |
755 | ||
1e0a84ea CL |
756 | int net_init_vhost_vdpa(const Netdev *netdev, const char *name, |
757 | NetClientState *peer, Error **errp) | |
758 | { | |
759 | const NetdevVhostVDPAOptions *opts; | |
8170ab3f | 760 | uint64_t features; |
654790b6 | 761 | int vdpa_device_fd; |
eb3cb751 | 762 | g_autofree NetClientState **ncs = NULL; |
1576dbb5 | 763 | g_autoptr(VhostIOVATree) iova_tree = NULL; |
a585fad2 | 764 | struct vhost_vdpa_iova_range iova_range; |
eb3cb751 | 765 | NetClientState *nc; |
aed5da45 | 766 | int queue_pairs, r, i = 0, has_cvq = 0; |
1e0a84ea CL |
767 | |
768 | assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
769 | opts = &netdev->u.vhost_vdpa; | |
7480874a | 770 | if (!opts->vhostdev && !opts->vhostfd) { |
8801ccd0 SWL |
771 | error_setg(errp, |
772 | "vhost-vdpa: neither vhostdev= nor vhostfd= was specified"); | |
c8295404 EP |
773 | return -1; |
774 | } | |
7327813d | 775 | |
7480874a | 776 | if (opts->vhostdev && opts->vhostfd) { |
8801ccd0 SWL |
777 | error_setg(errp, |
778 | "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive"); | |
779 | return -1; | |
780 | } | |
781 | ||
7480874a | 782 | if (opts->vhostdev) { |
8801ccd0 SWL |
783 | vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); |
784 | if (vdpa_device_fd == -1) { | |
785 | return -errno; | |
786 | } | |
5107fd3e PM |
787 | } else { |
788 | /* has_vhostfd */ | |
8801ccd0 SWL |
789 | vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp); |
790 | if (vdpa_device_fd == -1) { | |
791 | error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: "); | |
792 | return -1; | |
793 | } | |
7327813d JW |
794 | } |
795 | ||
8170ab3f EP |
796 | r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); |
797 | if (unlikely(r < 0)) { | |
aed5da45 | 798 | goto err; |
8170ab3f EP |
799 | } |
800 | ||
801 | queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, | |
40237840 JW |
802 | &has_cvq, errp); |
803 | if (queue_pairs < 0) { | |
7327813d | 804 | qemu_close(vdpa_device_fd); |
40237840 JW |
805 | return queue_pairs; |
806 | } | |
807 | ||
bf7a2ad8 LM |
808 | r = vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); |
809 | if (unlikely(r < 0)) { | |
810 | error_setg(errp, "vhost-vdpa: get iova range failed: %s", | |
811 | strerror(-r)); | |
812 | goto err; | |
813 | } | |
814 | ||
1576dbb5 | 815 | if (opts->x_svq) { |
36e46472 | 816 | if (!vhost_vdpa_net_valid_svq_features(features, errp)) { |
1576dbb5 EP |
817 | goto err_svq; |
818 | } | |
819 | ||
1576dbb5 EP |
820 | iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last); |
821 | } | |
822 | ||
40237840 JW |
823 | ncs = g_malloc0(sizeof(*ncs) * queue_pairs); |
824 | ||
825 | for (i = 0; i < queue_pairs; i++) { | |
826 | ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, | |
1576dbb5 | 827 | vdpa_device_fd, i, 2, true, opts->x_svq, |
a585fad2 | 828 | iova_range, iova_tree); |
40237840 JW |
829 | if (!ncs[i]) |
830 | goto err; | |
7327813d JW |
831 | } |
832 | ||
40237840 JW |
833 | if (has_cvq) { |
834 | nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, | |
1576dbb5 | 835 | vdpa_device_fd, i, 1, false, |
a585fad2 | 836 | opts->x_svq, iova_range, iova_tree); |
40237840 JW |
837 | if (!nc) |
838 | goto err; | |
839 | } | |
840 | ||
1576dbb5 EP |
841 | /* iova_tree ownership belongs to last NetClientState */ |
842 | g_steal_pointer(&iova_tree); | |
654790b6 | 843 | return 0; |
40237840 JW |
844 | |
845 | err: | |
846 | if (i) { | |
9bd05507 SWL |
847 | for (i--; i >= 0; i--) { |
848 | qemu_del_net_client(ncs[i]); | |
849 | } | |
40237840 | 850 | } |
1576dbb5 EP |
851 | |
852 | err_svq: | |
40237840 | 853 | qemu_close(vdpa_device_fd); |
40237840 JW |
854 | |
855 | return -1; | |
1e0a84ea | 856 | } |