xref: /openbmc/qemu/net/vhost-vdpa.c (revision 75bbe5e5) 
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"
21 #include <linux/vhost.h>
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;
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,
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,
63     VIRTIO_F_IOMMU_PLATFORM,
64     VIRTIO_F_RING_PACKED,
65     VIRTIO_NET_F_RSS,
66     VIRTIO_NET_F_HASH_REPORT,
67     VIRTIO_NET_F_GUEST_ANNOUNCE,
68     VIRTIO_NET_F_STATUS,
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 
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 
93 static int vhost_vdpa_add(NetClientState *ncs, void *be,
94                           int queue_pair_index, int nvqs)
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;
107     options.nvqs = nvqs;
108 
109     net = vhost_net_init(&options);
110     if (!net) {
111         error_report("failed to init vhost_net for queue");
112         goto err_init;
113     }
114     s->vhost_net = net;
115     ret = vhost_vdpa_net_check_device_id(net);
116     if (ret) {
117         goto err_check;
118     }
119     return 0;
120 err_check:
121     vhost_net_cleanup(net);
122     g_free(net);
123 err_init:
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     }
136      if (s->vhost_vdpa.device_fd >= 0) {
137         qemu_close(s->vhost_vdpa.device_fd);
138         s->vhost_vdpa.device_fd = -1;
139     }
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 
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 
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 
180 static NetClientInfo net_vhost_vdpa_info = {
181         .type = NET_CLIENT_DRIVER_VHOST_VDPA,
182         .size = sizeof(VhostVDPAState),
183         .receive = vhost_vdpa_receive,
184         .cleanup = vhost_vdpa_cleanup,
185         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
186         .has_ufo = vhost_vdpa_has_ufo,
187         .check_peer_type = vhost_vdpa_check_peer_type,
188 };
189 
190 static NetClientState *net_vhost_vdpa_init(NetClientState *peer,
191                                            const char *device,
192                                            const char *name,
193                                            int vdpa_device_fd,
194                                            int queue_pair_index,
195                                            int nvqs,
196                                            bool is_datapath)
197 {
198     NetClientState *nc = NULL;
199     VhostVDPAState *s;
200     int ret = 0;
201     assert(name);
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     }
209     snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
210     s = DO_UPCAST(VhostVDPAState, nc, nc);
211 
212     s->vhost_vdpa.device_fd = vdpa_device_fd;
213     s->vhost_vdpa.index = queue_pair_index;
214     ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs);
215     if (ret) {
216         qemu_del_net_client(nc);
217         return NULL;
218     }
219     return nc;
220 }
221 
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);
225     g_autofree struct vhost_vdpa_config *config = NULL;
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 
261 int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
262                         NetClientState *peer, Error **errp)
263 {
264     const NetdevVhostVDPAOptions *opts;
265     int vdpa_device_fd;
266     g_autofree NetClientState **ncs = NULL;
267     NetClientState *nc;
268     int queue_pairs, i, has_cvq = 0;
269 
270     assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
271     opts = &netdev->u.vhost_vdpa;
272     if (!opts->vhostdev) {
273         error_setg(errp, "vdpa character device not specified with vhostdev");
274         return -1;
275     }
276 
277     vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp);
278     if (vdpa_device_fd == -1) {
279         return -errno;
280     }
281 
282     queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd,
283                                                  &has_cvq, errp);
284     if (queue_pairs < 0) {
285         qemu_close(vdpa_device_fd);
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;
296     }
297 
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 
305     return 0;
306 
307 err:
308     if (i) {
309         for (i--; i >= 0; i--) {
310             qemu_del_net_client(ncs[i]);
311         }
312     }
313     qemu_close(vdpa_device_fd);
314 
315     return -1;
316 }
317