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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 */ | |
38 | void *cvq_cmd_out_buffer, *cvq_cmd_in_buffer; | |
1e0a84ea CL |
39 | bool started; |
40 | } VhostVDPAState; | |
41 | ||
42 | const int vdpa_feature_bits[] = { | |
43 | VIRTIO_F_NOTIFY_ON_EMPTY, | |
44 | VIRTIO_RING_F_INDIRECT_DESC, | |
45 | VIRTIO_RING_F_EVENT_IDX, | |
46 | VIRTIO_F_ANY_LAYOUT, | |
47 | VIRTIO_F_VERSION_1, | |
48 | VIRTIO_NET_F_CSUM, | |
49 | VIRTIO_NET_F_GUEST_CSUM, | |
50 | VIRTIO_NET_F_GSO, | |
51 | VIRTIO_NET_F_GUEST_TSO4, | |
52 | VIRTIO_NET_F_GUEST_TSO6, | |
53 | VIRTIO_NET_F_GUEST_ECN, | |
54 | VIRTIO_NET_F_GUEST_UFO, | |
55 | VIRTIO_NET_F_HOST_TSO4, | |
56 | VIRTIO_NET_F_HOST_TSO6, | |
57 | VIRTIO_NET_F_HOST_ECN, | |
58 | VIRTIO_NET_F_HOST_UFO, | |
59 | VIRTIO_NET_F_MRG_RXBUF, | |
60 | VIRTIO_NET_F_MTU, | |
40237840 JW |
61 | VIRTIO_NET_F_CTRL_RX, |
62 | VIRTIO_NET_F_CTRL_RX_EXTRA, | |
63 | VIRTIO_NET_F_CTRL_VLAN, | |
64 | VIRTIO_NET_F_GUEST_ANNOUNCE, | |
65 | VIRTIO_NET_F_CTRL_MAC_ADDR, | |
66 | VIRTIO_NET_F_RSS, | |
67 | VIRTIO_NET_F_MQ, | |
68 | VIRTIO_NET_F_CTRL_VQ, | |
1e0a84ea CL |
69 | VIRTIO_F_IOMMU_PLATFORM, |
70 | VIRTIO_F_RING_PACKED, | |
0145c393 AM |
71 | VIRTIO_NET_F_RSS, |
72 | VIRTIO_NET_F_HASH_REPORT, | |
1e0a84ea | 73 | VIRTIO_NET_F_GUEST_ANNOUNCE, |
9aa47edd | 74 | VIRTIO_NET_F_STATUS, |
1e0a84ea CL |
75 | VHOST_INVALID_FEATURE_BIT |
76 | }; | |
77 | ||
1576dbb5 EP |
78 | /** Supported device specific feature bits with SVQ */ |
79 | static const uint64_t vdpa_svq_device_features = | |
80 | BIT_ULL(VIRTIO_NET_F_CSUM) | | |
81 | BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) | | |
82 | BIT_ULL(VIRTIO_NET_F_MTU) | | |
83 | BIT_ULL(VIRTIO_NET_F_MAC) | | |
84 | BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) | | |
85 | BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) | | |
86 | BIT_ULL(VIRTIO_NET_F_GUEST_ECN) | | |
87 | BIT_ULL(VIRTIO_NET_F_GUEST_UFO) | | |
88 | BIT_ULL(VIRTIO_NET_F_HOST_TSO4) | | |
89 | BIT_ULL(VIRTIO_NET_F_HOST_TSO6) | | |
90 | BIT_ULL(VIRTIO_NET_F_HOST_ECN) | | |
91 | BIT_ULL(VIRTIO_NET_F_HOST_UFO) | | |
92 | BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) | | |
93 | BIT_ULL(VIRTIO_NET_F_STATUS) | | |
94 | BIT_ULL(VIRTIO_NET_F_CTRL_VQ) | | |
95 | BIT_ULL(VIRTIO_F_ANY_LAYOUT) | | |
96 | BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) | | |
97 | BIT_ULL(VIRTIO_NET_F_RSC_EXT) | | |
98 | BIT_ULL(VIRTIO_NET_F_STANDBY); | |
99 | ||
1e0a84ea CL |
100 | VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) |
101 | { | |
102 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
103 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
104 | return s->vhost_net; | |
105 | } | |
106 | ||
1e0a84ea CL |
107 | static int vhost_vdpa_net_check_device_id(struct vhost_net *net) |
108 | { | |
109 | uint32_t device_id; | |
110 | int ret; | |
111 | struct vhost_dev *hdev; | |
112 | ||
113 | hdev = (struct vhost_dev *)&net->dev; | |
114 | ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); | |
115 | if (device_id != VIRTIO_ID_NET) { | |
116 | return -ENOTSUP; | |
117 | } | |
118 | return ret; | |
119 | } | |
120 | ||
40237840 JW |
121 | static int vhost_vdpa_add(NetClientState *ncs, void *be, |
122 | int queue_pair_index, int nvqs) | |
1e0a84ea CL |
123 | { |
124 | VhostNetOptions options; | |
125 | struct vhost_net *net = NULL; | |
126 | VhostVDPAState *s; | |
127 | int ret; | |
128 | ||
129 | options.backend_type = VHOST_BACKEND_TYPE_VDPA; | |
130 | assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
131 | s = DO_UPCAST(VhostVDPAState, nc, ncs); | |
132 | options.net_backend = ncs; | |
133 | options.opaque = be; | |
134 | options.busyloop_timeout = 0; | |
40237840 | 135 | options.nvqs = nvqs; |
1e0a84ea CL |
136 | |
137 | net = vhost_net_init(&options); | |
138 | if (!net) { | |
139 | error_report("failed to init vhost_net for queue"); | |
a97ef87a | 140 | goto err_init; |
1e0a84ea | 141 | } |
1e0a84ea CL |
142 | s->vhost_net = net; |
143 | ret = vhost_vdpa_net_check_device_id(net); | |
144 | if (ret) { | |
a97ef87a | 145 | goto err_check; |
1e0a84ea CL |
146 | } |
147 | return 0; | |
a97ef87a JW |
148 | err_check: |
149 | vhost_net_cleanup(net); | |
150 | g_free(net); | |
151 | err_init: | |
1e0a84ea CL |
152 | return -1; |
153 | } | |
154 | ||
155 | static void vhost_vdpa_cleanup(NetClientState *nc) | |
156 | { | |
157 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
1576dbb5 | 158 | struct vhost_dev *dev = &s->vhost_net->dev; |
1e0a84ea | 159 | |
2df4dd31 EP |
160 | qemu_vfree(s->cvq_cmd_out_buffer); |
161 | qemu_vfree(s->cvq_cmd_in_buffer); | |
1576dbb5 EP |
162 | if (dev->vq_index + dev->nvqs == dev->vq_index_end) { |
163 | g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); | |
164 | } | |
1e0a84ea CL |
165 | if (s->vhost_net) { |
166 | vhost_net_cleanup(s->vhost_net); | |
167 | g_free(s->vhost_net); | |
168 | s->vhost_net = NULL; | |
169 | } | |
57b3a7d8 CL |
170 | if (s->vhost_vdpa.device_fd >= 0) { |
171 | qemu_close(s->vhost_vdpa.device_fd); | |
172 | s->vhost_vdpa.device_fd = -1; | |
173 | } | |
1e0a84ea CL |
174 | } |
175 | ||
176 | static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) | |
177 | { | |
178 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
179 | ||
180 | return true; | |
181 | } | |
182 | ||
183 | static bool vhost_vdpa_has_ufo(NetClientState *nc) | |
184 | { | |
185 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
186 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
187 | uint64_t features = 0; | |
188 | features |= (1ULL << VIRTIO_NET_F_HOST_UFO); | |
189 | features = vhost_net_get_features(s->vhost_net, features); | |
190 | return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); | |
191 | ||
192 | } | |
193 | ||
ee8a1c63 KW |
194 | static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, |
195 | Error **errp) | |
196 | { | |
197 | const char *driver = object_class_get_name(oc); | |
198 | ||
199 | if (!g_str_has_prefix(driver, "virtio-net-")) { | |
200 | error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); | |
201 | return false; | |
202 | } | |
203 | ||
204 | return true; | |
205 | } | |
206 | ||
846a1e85 EP |
207 | /** Dummy receive in case qemu falls back to userland tap networking */ |
208 | static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, | |
209 | size_t size) | |
210 | { | |
211 | return 0; | |
212 | } | |
213 | ||
1e0a84ea CL |
214 | static NetClientInfo net_vhost_vdpa_info = { |
215 | .type = NET_CLIENT_DRIVER_VHOST_VDPA, | |
216 | .size = sizeof(VhostVDPAState), | |
846a1e85 | 217 | .receive = vhost_vdpa_receive, |
1e0a84ea CL |
218 | .cleanup = vhost_vdpa_cleanup, |
219 | .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, | |
220 | .has_ufo = vhost_vdpa_has_ufo, | |
ee8a1c63 | 221 | .check_peer_type = vhost_vdpa_check_peer_type, |
1e0a84ea CL |
222 | }; |
223 | ||
2df4dd31 EP |
224 | static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) |
225 | { | |
226 | VhostIOVATree *tree = v->iova_tree; | |
227 | DMAMap needle = { | |
228 | /* | |
229 | * No need to specify size or to look for more translations since | |
230 | * this contiguous chunk was allocated by us. | |
231 | */ | |
232 | .translated_addr = (hwaddr)(uintptr_t)addr, | |
233 | }; | |
234 | const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); | |
235 | int r; | |
236 | ||
237 | if (unlikely(!map)) { | |
238 | error_report("Cannot locate expected map"); | |
239 | return; | |
240 | } | |
241 | ||
242 | r = vhost_vdpa_dma_unmap(v, map->iova, map->size + 1); | |
243 | if (unlikely(r != 0)) { | |
244 | error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); | |
245 | } | |
246 | ||
69292a8e | 247 | vhost_iova_tree_remove(tree, *map); |
2df4dd31 EP |
248 | } |
249 | ||
250 | static size_t vhost_vdpa_net_cvq_cmd_len(void) | |
251 | { | |
252 | /* | |
253 | * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. | |
254 | * In buffer is always 1 byte, so it should fit here | |
255 | */ | |
256 | return sizeof(struct virtio_net_ctrl_hdr) + | |
257 | 2 * sizeof(struct virtio_net_ctrl_mac) + | |
258 | MAC_TABLE_ENTRIES * ETH_ALEN; | |
259 | } | |
260 | ||
261 | static size_t vhost_vdpa_net_cvq_cmd_page_len(void) | |
262 | { | |
263 | return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); | |
264 | } | |
265 | ||
7a7f87e9 EP |
266 | /** Map CVQ buffer. */ |
267 | static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, | |
268 | bool write) | |
2df4dd31 EP |
269 | { |
270 | DMAMap map = {}; | |
271 | int r; | |
272 | ||
2df4dd31 | 273 | map.translated_addr = (hwaddr)(uintptr_t)buf; |
7a7f87e9 | 274 | map.size = size - 1; |
2df4dd31 EP |
275 | map.perm = write ? IOMMU_RW : IOMMU_RO, |
276 | r = vhost_iova_tree_map_alloc(v->iova_tree, &map); | |
277 | if (unlikely(r != IOVA_OK)) { | |
278 | error_report("Cannot map injected element"); | |
7a7f87e9 | 279 | return r; |
2df4dd31 EP |
280 | } |
281 | ||
282 | r = vhost_vdpa_dma_map(v, map.iova, vhost_vdpa_net_cvq_cmd_page_len(), buf, | |
283 | !write); | |
284 | if (unlikely(r < 0)) { | |
285 | goto dma_map_err; | |
286 | } | |
287 | ||
7a7f87e9 | 288 | return 0; |
2df4dd31 EP |
289 | |
290 | dma_map_err: | |
69292a8e | 291 | vhost_iova_tree_remove(v->iova_tree, map); |
7a7f87e9 | 292 | return r; |
2df4dd31 EP |
293 | } |
294 | ||
7a7f87e9 | 295 | static int vhost_vdpa_net_cvq_start(NetClientState *nc) |
2df4dd31 | 296 | { |
7a7f87e9 EP |
297 | VhostVDPAState *s; |
298 | int r; | |
2df4dd31 | 299 | |
7a7f87e9 EP |
300 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); |
301 | ||
302 | s = DO_UPCAST(VhostVDPAState, nc, nc); | |
303 | if (!s->vhost_vdpa.shadow_vqs_enabled) { | |
304 | return 0; | |
2df4dd31 EP |
305 | } |
306 | ||
7a7f87e9 EP |
307 | r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, |
308 | vhost_vdpa_net_cvq_cmd_page_len(), false); | |
309 | if (unlikely(r < 0)) { | |
310 | return r; | |
311 | } | |
312 | ||
313 | r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_in_buffer, | |
314 | vhost_vdpa_net_cvq_cmd_page_len(), true); | |
315 | if (unlikely(r < 0)) { | |
2df4dd31 | 316 | vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); |
2df4dd31 EP |
317 | } |
318 | ||
7a7f87e9 EP |
319 | return r; |
320 | } | |
321 | ||
322 | static void vhost_vdpa_net_cvq_stop(NetClientState *nc) | |
323 | { | |
324 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
325 | ||
326 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
327 | ||
328 | if (s->vhost_vdpa.shadow_vqs_enabled) { | |
329 | vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); | |
330 | vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_in_buffer); | |
331 | } | |
2df4dd31 EP |
332 | } |
333 | ||
be4278b6 EP |
334 | static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, |
335 | size_t in_len) | |
336 | { | |
337 | /* Buffers for the device */ | |
338 | const struct iovec out = { | |
339 | .iov_base = s->cvq_cmd_out_buffer, | |
340 | .iov_len = out_len, | |
341 | }; | |
342 | const struct iovec in = { | |
343 | .iov_base = s->cvq_cmd_in_buffer, | |
344 | .iov_len = sizeof(virtio_net_ctrl_ack), | |
345 | }; | |
346 | VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); | |
347 | int r; | |
348 | ||
349 | r = vhost_svq_add(svq, &out, 1, &in, 1, NULL); | |
350 | if (unlikely(r != 0)) { | |
351 | if (unlikely(r == -ENOSPC)) { | |
352 | qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", | |
353 | __func__); | |
354 | } | |
355 | return r; | |
356 | } | |
357 | ||
358 | /* | |
359 | * We can poll here since we've had BQL from the time we sent the | |
360 | * descriptor. Also, we need to take the answer before SVQ pulls by itself, | |
361 | * when BQL is released | |
362 | */ | |
363 | return vhost_svq_poll(svq); | |
364 | } | |
365 | ||
dd036d8d EP |
366 | static int vhost_vdpa_net_load(NetClientState *nc) |
367 | { | |
368 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
369 | const struct vhost_vdpa *v = &s->vhost_vdpa; | |
370 | const VirtIONet *n; | |
371 | uint64_t features; | |
372 | ||
373 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
374 | ||
375 | if (!v->shadow_vqs_enabled) { | |
376 | return 0; | |
377 | } | |
378 | ||
379 | n = VIRTIO_NET(v->dev->vdev); | |
380 | features = n->parent_obj.guest_features; | |
381 | if (features & BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR)) { | |
382 | const struct virtio_net_ctrl_hdr ctrl = { | |
383 | .class = VIRTIO_NET_CTRL_MAC, | |
384 | .cmd = VIRTIO_NET_CTRL_MAC_ADDR_SET, | |
385 | }; | |
386 | char *cursor = s->cvq_cmd_out_buffer; | |
387 | ssize_t dev_written; | |
388 | ||
389 | memcpy(cursor, &ctrl, sizeof(ctrl)); | |
390 | cursor += sizeof(ctrl); | |
391 | memcpy(cursor, n->mac, sizeof(n->mac)); | |
392 | ||
393 | dev_written = vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + sizeof(n->mac), | |
394 | sizeof(virtio_net_ctrl_ack)); | |
395 | if (unlikely(dev_written < 0)) { | |
396 | return dev_written; | |
397 | } | |
398 | ||
399 | return *((virtio_net_ctrl_ack *)s->cvq_cmd_in_buffer) != VIRTIO_NET_OK; | |
400 | } | |
401 | ||
402 | return 0; | |
403 | } | |
404 | ||
f8972b56 EP |
405 | static NetClientInfo net_vhost_vdpa_cvq_info = { |
406 | .type = NET_CLIENT_DRIVER_VHOST_VDPA, | |
407 | .size = sizeof(VhostVDPAState), | |
408 | .receive = vhost_vdpa_receive, | |
7a7f87e9 | 409 | .start = vhost_vdpa_net_cvq_start, |
dd036d8d | 410 | .load = vhost_vdpa_net_load, |
7a7f87e9 | 411 | .stop = vhost_vdpa_net_cvq_stop, |
f8972b56 EP |
412 | .cleanup = vhost_vdpa_cleanup, |
413 | .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, | |
414 | .has_ufo = vhost_vdpa_has_ufo, | |
415 | .check_peer_type = vhost_vdpa_check_peer_type, | |
416 | }; | |
417 | ||
2df4dd31 EP |
418 | /** |
419 | * Do not forward commands not supported by SVQ. Otherwise, the device could | |
420 | * accept it and qemu would not know how to update the device model. | |
421 | */ | |
7a7f87e9 | 422 | static bool vhost_vdpa_net_cvq_validate_cmd(const void *out_buf, size_t len) |
2df4dd31 EP |
423 | { |
424 | struct virtio_net_ctrl_hdr ctrl; | |
2df4dd31 | 425 | |
7a7f87e9 | 426 | if (unlikely(len < sizeof(ctrl))) { |
2df4dd31 | 427 | qemu_log_mask(LOG_GUEST_ERROR, |
7a7f87e9 | 428 | "%s: invalid legnth of out buffer %zu\n", __func__, len); |
2df4dd31 EP |
429 | return false; |
430 | } | |
431 | ||
7a7f87e9 | 432 | memcpy(&ctrl, out_buf, sizeof(ctrl)); |
2df4dd31 EP |
433 | switch (ctrl.class) { |
434 | case VIRTIO_NET_CTRL_MAC: | |
435 | switch (ctrl.cmd) { | |
436 | case VIRTIO_NET_CTRL_MAC_ADDR_SET: | |
437 | return true; | |
438 | default: | |
439 | qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid mac cmd %u\n", | |
440 | __func__, ctrl.cmd); | |
441 | }; | |
442 | break; | |
443 | default: | |
444 | qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid control class %u\n", | |
445 | __func__, ctrl.class); | |
446 | }; | |
447 | ||
448 | return false; | |
449 | } | |
450 | ||
451 | /** | |
452 | * Validate and copy control virtqueue commands. | |
453 | * | |
454 | * Following QEMU guidelines, we offer a copy of the buffers to the device to | |
455 | * prevent TOCTOU bugs. | |
bd907ae4 EP |
456 | */ |
457 | static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, | |
458 | VirtQueueElement *elem, | |
459 | void *opaque) | |
460 | { | |
2df4dd31 | 461 | VhostVDPAState *s = opaque; |
be4278b6 | 462 | size_t in_len; |
bd907ae4 | 463 | virtio_net_ctrl_ack status = VIRTIO_NET_ERR; |
7a7f87e9 EP |
464 | /* Out buffer sent to both the vdpa device and the device model */ |
465 | struct iovec out = { | |
466 | .iov_base = s->cvq_cmd_out_buffer, | |
467 | }; | |
2df4dd31 EP |
468 | /* in buffer used for device model */ |
469 | const struct iovec in = { | |
470 | .iov_base = &status, | |
471 | .iov_len = sizeof(status), | |
472 | }; | |
be4278b6 | 473 | ssize_t dev_written = -EINVAL; |
2df4dd31 EP |
474 | bool ok; |
475 | ||
7a7f87e9 EP |
476 | out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, |
477 | s->cvq_cmd_out_buffer, | |
478 | vhost_vdpa_net_cvq_cmd_len()); | |
479 | ok = vhost_vdpa_net_cvq_validate_cmd(s->cvq_cmd_out_buffer, out.iov_len); | |
2df4dd31 EP |
480 | if (unlikely(!ok)) { |
481 | goto out; | |
482 | } | |
bd907ae4 | 483 | |
be4278b6 EP |
484 | dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); |
485 | if (unlikely(dev_written < 0)) { | |
bd907ae4 EP |
486 | goto out; |
487 | } | |
488 | ||
bd907ae4 EP |
489 | if (unlikely(dev_written < sizeof(status))) { |
490 | error_report("Insufficient written data (%zu)", dev_written); | |
2df4dd31 EP |
491 | goto out; |
492 | } | |
493 | ||
7a7f87e9 | 494 | memcpy(&status, s->cvq_cmd_in_buffer, sizeof(status)); |
2df4dd31 | 495 | if (status != VIRTIO_NET_OK) { |
be4278b6 | 496 | return VIRTIO_NET_ERR; |
2df4dd31 EP |
497 | } |
498 | ||
499 | status = VIRTIO_NET_ERR; | |
7a7f87e9 | 500 | virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1); |
2df4dd31 EP |
501 | if (status != VIRTIO_NET_OK) { |
502 | error_report("Bad CVQ processing in model"); | |
bd907ae4 EP |
503 | } |
504 | ||
505 | out: | |
506 | in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, | |
507 | sizeof(status)); | |
508 | if (unlikely(in_len < sizeof(status))) { | |
509 | error_report("Bad device CVQ written length"); | |
510 | } | |
511 | vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); | |
512 | g_free(elem); | |
be4278b6 | 513 | return dev_written < 0 ? dev_written : 0; |
bd907ae4 EP |
514 | } |
515 | ||
516 | static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { | |
517 | .avail_handler = vhost_vdpa_net_handle_ctrl_avail, | |
518 | }; | |
519 | ||
654790b6 JW |
520 | static NetClientState *net_vhost_vdpa_init(NetClientState *peer, |
521 | const char *device, | |
522 | const char *name, | |
40237840 JW |
523 | int vdpa_device_fd, |
524 | int queue_pair_index, | |
525 | int nvqs, | |
1576dbb5 EP |
526 | bool is_datapath, |
527 | bool svq, | |
528 | VhostIOVATree *iova_tree) | |
1e0a84ea CL |
529 | { |
530 | NetClientState *nc = NULL; | |
531 | VhostVDPAState *s; | |
1e0a84ea CL |
532 | int ret = 0; |
533 | assert(name); | |
40237840 JW |
534 | if (is_datapath) { |
535 | nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, | |
536 | name); | |
537 | } else { | |
f8972b56 | 538 | nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, |
40237840 JW |
539 | device, name); |
540 | } | |
56e6f594 | 541 | snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA); |
1e0a84ea | 542 | s = DO_UPCAST(VhostVDPAState, nc, nc); |
7327813d | 543 | |
1e0a84ea | 544 | s->vhost_vdpa.device_fd = vdpa_device_fd; |
40237840 | 545 | s->vhost_vdpa.index = queue_pair_index; |
1576dbb5 EP |
546 | s->vhost_vdpa.shadow_vqs_enabled = svq; |
547 | s->vhost_vdpa.iova_tree = iova_tree; | |
bd907ae4 | 548 | if (!is_datapath) { |
2df4dd31 EP |
549 | s->cvq_cmd_out_buffer = qemu_memalign(qemu_real_host_page_size(), |
550 | vhost_vdpa_net_cvq_cmd_page_len()); | |
551 | memset(s->cvq_cmd_out_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len()); | |
552 | s->cvq_cmd_in_buffer = qemu_memalign(qemu_real_host_page_size(), | |
553 | vhost_vdpa_net_cvq_cmd_page_len()); | |
554 | memset(s->cvq_cmd_in_buffer, 0, vhost_vdpa_net_cvq_cmd_page_len()); | |
555 | ||
bd907ae4 EP |
556 | s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; |
557 | s->vhost_vdpa.shadow_vq_ops_opaque = s; | |
558 | } | |
40237840 | 559 | ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); |
74af5eec | 560 | if (ret) { |
74af5eec | 561 | qemu_del_net_client(nc); |
654790b6 | 562 | return NULL; |
74af5eec | 563 | } |
654790b6 | 564 | return nc; |
1e0a84ea CL |
565 | } |
566 | ||
1576dbb5 EP |
567 | static int vhost_vdpa_get_iova_range(int fd, |
568 | struct vhost_vdpa_iova_range *iova_range) | |
569 | { | |
570 | int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range); | |
571 | ||
572 | return ret < 0 ? -errno : 0; | |
573 | } | |
574 | ||
8170ab3f EP |
575 | static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) |
576 | { | |
577 | int ret = ioctl(fd, VHOST_GET_FEATURES, features); | |
578 | if (unlikely(ret < 0)) { | |
579 | error_setg_errno(errp, errno, | |
580 | "Fail to query features from vhost-vDPA device"); | |
581 | } | |
582 | return ret; | |
583 | } | |
584 | ||
585 | static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, | |
586 | int *has_cvq, Error **errp) | |
40237840 JW |
587 | { |
588 | unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); | |
cd523a41 | 589 | g_autofree struct vhost_vdpa_config *config = NULL; |
40237840 | 590 | __virtio16 *max_queue_pairs; |
40237840 JW |
591 | int ret; |
592 | ||
40237840 JW |
593 | if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { |
594 | *has_cvq = 1; | |
595 | } else { | |
596 | *has_cvq = 0; | |
597 | } | |
598 | ||
599 | if (features & (1 << VIRTIO_NET_F_MQ)) { | |
600 | config = g_malloc0(config_size + sizeof(*max_queue_pairs)); | |
601 | config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); | |
602 | config->len = sizeof(*max_queue_pairs); | |
603 | ||
604 | ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); | |
605 | if (ret) { | |
606 | error_setg(errp, "Fail to get config from vhost-vDPA device"); | |
607 | return -ret; | |
608 | } | |
609 | ||
610 | max_queue_pairs = (__virtio16 *)&config->buf; | |
611 | ||
612 | return lduw_le_p(max_queue_pairs); | |
613 | } | |
614 | ||
615 | return 1; | |
616 | } | |
617 | ||
1e0a84ea CL |
618 | int net_init_vhost_vdpa(const Netdev *netdev, const char *name, |
619 | NetClientState *peer, Error **errp) | |
620 | { | |
621 | const NetdevVhostVDPAOptions *opts; | |
8170ab3f | 622 | uint64_t features; |
654790b6 | 623 | int vdpa_device_fd; |
eb3cb751 | 624 | g_autofree NetClientState **ncs = NULL; |
1576dbb5 | 625 | g_autoptr(VhostIOVATree) iova_tree = NULL; |
eb3cb751 | 626 | NetClientState *nc; |
aed5da45 | 627 | int queue_pairs, r, i = 0, has_cvq = 0; |
1e0a84ea CL |
628 | |
629 | assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
630 | opts = &netdev->u.vhost_vdpa; | |
c8295404 EP |
631 | if (!opts->vhostdev) { |
632 | error_setg(errp, "vdpa character device not specified with vhostdev"); | |
633 | return -1; | |
634 | } | |
7327813d | 635 | |
0351152b | 636 | vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); |
7327813d JW |
637 | if (vdpa_device_fd == -1) { |
638 | return -errno; | |
639 | } | |
640 | ||
8170ab3f EP |
641 | r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); |
642 | if (unlikely(r < 0)) { | |
aed5da45 | 643 | goto err; |
8170ab3f EP |
644 | } |
645 | ||
646 | queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, | |
40237840 JW |
647 | &has_cvq, errp); |
648 | if (queue_pairs < 0) { | |
7327813d | 649 | qemu_close(vdpa_device_fd); |
40237840 JW |
650 | return queue_pairs; |
651 | } | |
652 | ||
1576dbb5 EP |
653 | if (opts->x_svq) { |
654 | struct vhost_vdpa_iova_range iova_range; | |
655 | ||
656 | uint64_t invalid_dev_features = | |
657 | features & ~vdpa_svq_device_features & | |
658 | /* Transport are all accepted at this point */ | |
659 | ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, | |
660 | VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); | |
661 | ||
662 | if (invalid_dev_features) { | |
663 | error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, | |
664 | invalid_dev_features); | |
665 | goto err_svq; | |
666 | } | |
667 | ||
668 | vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); | |
669 | iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last); | |
670 | } | |
671 | ||
40237840 JW |
672 | ncs = g_malloc0(sizeof(*ncs) * queue_pairs); |
673 | ||
674 | for (i = 0; i < queue_pairs; i++) { | |
675 | ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, | |
1576dbb5 EP |
676 | vdpa_device_fd, i, 2, true, opts->x_svq, |
677 | iova_tree); | |
40237840 JW |
678 | if (!ncs[i]) |
679 | goto err; | |
7327813d JW |
680 | } |
681 | ||
40237840 JW |
682 | if (has_cvq) { |
683 | nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, | |
1576dbb5 EP |
684 | vdpa_device_fd, i, 1, false, |
685 | opts->x_svq, iova_tree); | |
40237840 JW |
686 | if (!nc) |
687 | goto err; | |
688 | } | |
689 | ||
1576dbb5 EP |
690 | /* iova_tree ownership belongs to last NetClientState */ |
691 | g_steal_pointer(&iova_tree); | |
654790b6 | 692 | return 0; |
40237840 JW |
693 | |
694 | err: | |
695 | if (i) { | |
9bd05507 SWL |
696 | for (i--; i >= 0; i--) { |
697 | qemu_del_net_client(ncs[i]); | |
698 | } | |
40237840 | 699 | } |
1576dbb5 EP |
700 | |
701 | err_svq: | |
40237840 | 702 | qemu_close(vdpa_device_fd); |
40237840 JW |
703 | |
704 | return -1; | |
1e0a84ea | 705 | } |