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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" | |
14 | #include "net/vhost_net.h" | |
15 | #include "net/vhost-vdpa.h" | |
16 | #include "hw/virtio/vhost-vdpa.h" | |
17 | #include "qemu/config-file.h" | |
18 | #include "qemu/error-report.h" | |
19 | #include "qemu/option.h" | |
20 | #include "qapi/error.h" | |
40237840 | 21 | #include <linux/vhost.h> |
1e0a84ea CL |
22 | #include <sys/ioctl.h> |
23 | #include <err.h> | |
24 | #include "standard-headers/linux/virtio_net.h" | |
25 | #include "monitor/monitor.h" | |
26 | #include "hw/virtio/vhost.h" | |
27 | ||
28 | /* Todo:need to add the multiqueue support here */ | |
29 | typedef struct VhostVDPAState { | |
30 | NetClientState nc; | |
31 | struct vhost_vdpa vhost_vdpa; | |
32 | VHostNetState *vhost_net; | |
1e0a84ea CL |
33 | bool started; |
34 | } VhostVDPAState; | |
35 | ||
36 | const int vdpa_feature_bits[] = { | |
37 | VIRTIO_F_NOTIFY_ON_EMPTY, | |
38 | VIRTIO_RING_F_INDIRECT_DESC, | |
39 | VIRTIO_RING_F_EVENT_IDX, | |
40 | VIRTIO_F_ANY_LAYOUT, | |
41 | VIRTIO_F_VERSION_1, | |
42 | VIRTIO_NET_F_CSUM, | |
43 | VIRTIO_NET_F_GUEST_CSUM, | |
44 | VIRTIO_NET_F_GSO, | |
45 | VIRTIO_NET_F_GUEST_TSO4, | |
46 | VIRTIO_NET_F_GUEST_TSO6, | |
47 | VIRTIO_NET_F_GUEST_ECN, | |
48 | VIRTIO_NET_F_GUEST_UFO, | |
49 | VIRTIO_NET_F_HOST_TSO4, | |
50 | VIRTIO_NET_F_HOST_TSO6, | |
51 | VIRTIO_NET_F_HOST_ECN, | |
52 | VIRTIO_NET_F_HOST_UFO, | |
53 | VIRTIO_NET_F_MRG_RXBUF, | |
54 | VIRTIO_NET_F_MTU, | |
40237840 JW |
55 | VIRTIO_NET_F_CTRL_RX, |
56 | VIRTIO_NET_F_CTRL_RX_EXTRA, | |
57 | VIRTIO_NET_F_CTRL_VLAN, | |
58 | VIRTIO_NET_F_GUEST_ANNOUNCE, | |
59 | VIRTIO_NET_F_CTRL_MAC_ADDR, | |
60 | VIRTIO_NET_F_RSS, | |
61 | VIRTIO_NET_F_MQ, | |
62 | VIRTIO_NET_F_CTRL_VQ, | |
1e0a84ea CL |
63 | VIRTIO_F_IOMMU_PLATFORM, |
64 | VIRTIO_F_RING_PACKED, | |
0145c393 AM |
65 | VIRTIO_NET_F_RSS, |
66 | VIRTIO_NET_F_HASH_REPORT, | |
1e0a84ea | 67 | VIRTIO_NET_F_GUEST_ANNOUNCE, |
9aa47edd | 68 | VIRTIO_NET_F_STATUS, |
1e0a84ea CL |
69 | VHOST_INVALID_FEATURE_BIT |
70 | }; | |
71 | ||
72 | VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) | |
73 | { | |
74 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
75 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
76 | return s->vhost_net; | |
77 | } | |
78 | ||
1e0a84ea CL |
79 | static int vhost_vdpa_net_check_device_id(struct vhost_net *net) |
80 | { | |
81 | uint32_t device_id; | |
82 | int ret; | |
83 | struct vhost_dev *hdev; | |
84 | ||
85 | hdev = (struct vhost_dev *)&net->dev; | |
86 | ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); | |
87 | if (device_id != VIRTIO_ID_NET) { | |
88 | return -ENOTSUP; | |
89 | } | |
90 | return ret; | |
91 | } | |
92 | ||
40237840 JW |
93 | static int vhost_vdpa_add(NetClientState *ncs, void *be, |
94 | int queue_pair_index, int nvqs) | |
1e0a84ea CL |
95 | { |
96 | VhostNetOptions options; | |
97 | struct vhost_net *net = NULL; | |
98 | VhostVDPAState *s; | |
99 | int ret; | |
100 | ||
101 | options.backend_type = VHOST_BACKEND_TYPE_VDPA; | |
102 | assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
103 | s = DO_UPCAST(VhostVDPAState, nc, ncs); | |
104 | options.net_backend = ncs; | |
105 | options.opaque = be; | |
106 | options.busyloop_timeout = 0; | |
40237840 | 107 | options.nvqs = nvqs; |
1e0a84ea CL |
108 | |
109 | net = vhost_net_init(&options); | |
110 | if (!net) { | |
111 | error_report("failed to init vhost_net for queue"); | |
a97ef87a | 112 | goto err_init; |
1e0a84ea | 113 | } |
1e0a84ea CL |
114 | s->vhost_net = net; |
115 | ret = vhost_vdpa_net_check_device_id(net); | |
116 | if (ret) { | |
a97ef87a | 117 | goto err_check; |
1e0a84ea CL |
118 | } |
119 | return 0; | |
a97ef87a JW |
120 | err_check: |
121 | vhost_net_cleanup(net); | |
122 | g_free(net); | |
123 | err_init: | |
1e0a84ea CL |
124 | return -1; |
125 | } | |
126 | ||
127 | static void vhost_vdpa_cleanup(NetClientState *nc) | |
128 | { | |
129 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
130 | ||
131 | if (s->vhost_net) { | |
132 | vhost_net_cleanup(s->vhost_net); | |
133 | g_free(s->vhost_net); | |
134 | s->vhost_net = NULL; | |
135 | } | |
57b3a7d8 CL |
136 | if (s->vhost_vdpa.device_fd >= 0) { |
137 | qemu_close(s->vhost_vdpa.device_fd); | |
138 | s->vhost_vdpa.device_fd = -1; | |
139 | } | |
1e0a84ea CL |
140 | } |
141 | ||
142 | static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) | |
143 | { | |
144 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
145 | ||
146 | return true; | |
147 | } | |
148 | ||
149 | static bool vhost_vdpa_has_ufo(NetClientState *nc) | |
150 | { | |
151 | assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
152 | VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); | |
153 | uint64_t features = 0; | |
154 | features |= (1ULL << VIRTIO_NET_F_HOST_UFO); | |
155 | features = vhost_net_get_features(s->vhost_net, features); | |
156 | return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); | |
157 | ||
158 | } | |
159 | ||
ee8a1c63 KW |
160 | static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, |
161 | Error **errp) | |
162 | { | |
163 | const char *driver = object_class_get_name(oc); | |
164 | ||
165 | if (!g_str_has_prefix(driver, "virtio-net-")) { | |
166 | error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); | |
167 | return false; | |
168 | } | |
169 | ||
170 | return true; | |
171 | } | |
172 | ||
846a1e85 EP |
173 | /** Dummy receive in case qemu falls back to userland tap networking */ |
174 | static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, | |
175 | size_t size) | |
176 | { | |
177 | return 0; | |
178 | } | |
179 | ||
1e0a84ea CL |
180 | static NetClientInfo net_vhost_vdpa_info = { |
181 | .type = NET_CLIENT_DRIVER_VHOST_VDPA, | |
182 | .size = sizeof(VhostVDPAState), | |
846a1e85 | 183 | .receive = vhost_vdpa_receive, |
1e0a84ea CL |
184 | .cleanup = vhost_vdpa_cleanup, |
185 | .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, | |
186 | .has_ufo = vhost_vdpa_has_ufo, | |
ee8a1c63 | 187 | .check_peer_type = vhost_vdpa_check_peer_type, |
1e0a84ea CL |
188 | }; |
189 | ||
654790b6 JW |
190 | static NetClientState *net_vhost_vdpa_init(NetClientState *peer, |
191 | const char *device, | |
192 | const char *name, | |
40237840 JW |
193 | int vdpa_device_fd, |
194 | int queue_pair_index, | |
195 | int nvqs, | |
196 | bool is_datapath) | |
1e0a84ea CL |
197 | { |
198 | NetClientState *nc = NULL; | |
199 | VhostVDPAState *s; | |
1e0a84ea CL |
200 | int ret = 0; |
201 | assert(name); | |
40237840 JW |
202 | if (is_datapath) { |
203 | nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, | |
204 | name); | |
205 | } else { | |
206 | nc = qemu_new_net_control_client(&net_vhost_vdpa_info, peer, | |
207 | device, name); | |
208 | } | |
56e6f594 | 209 | snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA); |
1e0a84ea | 210 | s = DO_UPCAST(VhostVDPAState, nc, nc); |
7327813d | 211 | |
1e0a84ea | 212 | s->vhost_vdpa.device_fd = vdpa_device_fd; |
40237840 JW |
213 | s->vhost_vdpa.index = queue_pair_index; |
214 | ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); | |
74af5eec | 215 | if (ret) { |
74af5eec | 216 | qemu_del_net_client(nc); |
654790b6 | 217 | return NULL; |
74af5eec | 218 | } |
654790b6 | 219 | return nc; |
1e0a84ea CL |
220 | } |
221 | ||
40237840 JW |
222 | static int vhost_vdpa_get_max_queue_pairs(int fd, int *has_cvq, Error **errp) |
223 | { | |
224 | unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); | |
cd523a41 | 225 | g_autofree struct vhost_vdpa_config *config = NULL; |
40237840 JW |
226 | __virtio16 *max_queue_pairs; |
227 | uint64_t features; | |
228 | int ret; | |
229 | ||
230 | ret = ioctl(fd, VHOST_GET_FEATURES, &features); | |
231 | if (ret) { | |
232 | error_setg(errp, "Fail to query features from vhost-vDPA device"); | |
233 | return ret; | |
234 | } | |
235 | ||
236 | if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { | |
237 | *has_cvq = 1; | |
238 | } else { | |
239 | *has_cvq = 0; | |
240 | } | |
241 | ||
242 | if (features & (1 << VIRTIO_NET_F_MQ)) { | |
243 | config = g_malloc0(config_size + sizeof(*max_queue_pairs)); | |
244 | config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); | |
245 | config->len = sizeof(*max_queue_pairs); | |
246 | ||
247 | ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); | |
248 | if (ret) { | |
249 | error_setg(errp, "Fail to get config from vhost-vDPA device"); | |
250 | return -ret; | |
251 | } | |
252 | ||
253 | max_queue_pairs = (__virtio16 *)&config->buf; | |
254 | ||
255 | return lduw_le_p(max_queue_pairs); | |
256 | } | |
257 | ||
258 | return 1; | |
259 | } | |
260 | ||
1e0a84ea CL |
261 | int net_init_vhost_vdpa(const Netdev *netdev, const char *name, |
262 | NetClientState *peer, Error **errp) | |
263 | { | |
264 | const NetdevVhostVDPAOptions *opts; | |
654790b6 | 265 | int vdpa_device_fd; |
eb3cb751 EP |
266 | g_autofree NetClientState **ncs = NULL; |
267 | NetClientState *nc; | |
40237840 | 268 | int queue_pairs, i, has_cvq = 0; |
1e0a84ea CL |
269 | |
270 | assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); | |
271 | opts = &netdev->u.vhost_vdpa; | |
c8295404 EP |
272 | if (!opts->vhostdev) { |
273 | error_setg(errp, "vdpa character device not specified with vhostdev"); | |
274 | return -1; | |
275 | } | |
7327813d | 276 | |
0351152b | 277 | vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); |
7327813d JW |
278 | if (vdpa_device_fd == -1) { |
279 | return -errno; | |
280 | } | |
281 | ||
40237840 JW |
282 | queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, |
283 | &has_cvq, errp); | |
284 | if (queue_pairs < 0) { | |
7327813d | 285 | qemu_close(vdpa_device_fd); |
40237840 JW |
286 | return queue_pairs; |
287 | } | |
288 | ||
289 | ncs = g_malloc0(sizeof(*ncs) * queue_pairs); | |
290 | ||
291 | for (i = 0; i < queue_pairs; i++) { | |
292 | ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, | |
293 | vdpa_device_fd, i, 2, true); | |
294 | if (!ncs[i]) | |
295 | goto err; | |
7327813d JW |
296 | } |
297 | ||
40237840 JW |
298 | if (has_cvq) { |
299 | nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, | |
300 | vdpa_device_fd, i, 1, false); | |
301 | if (!nc) | |
302 | goto err; | |
303 | } | |
304 | ||
654790b6 | 305 | return 0; |
40237840 JW |
306 | |
307 | err: | |
308 | if (i) { | |
9bd05507 SWL |
309 | for (i--; i >= 0; i--) { |
310 | qemu_del_net_client(ncs[i]); | |
311 | } | |
40237840 JW |
312 | } |
313 | qemu_close(vdpa_device_fd); | |
40237840 JW |
314 | |
315 | return -1; | |
1e0a84ea | 316 | } |