xref: /qemu/net/vhost-vdpa.c (revision 138ca49a) 
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 <sys/ioctl.h>
22 #include <err.h>
23 #include "standard-headers/linux/virtio_net.h"
24 #include "monitor/monitor.h"
25 #include "hw/virtio/vhost.h"
26 
27 /* Todo:need to add the multiqueue support here */
28 typedef struct VhostVDPAState {
29     NetClientState nc;
30     struct vhost_vdpa vhost_vdpa;
31     VHostNetState *vhost_net;
32     uint64_t acked_features;
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_F_IOMMU_PLATFORM,
56     VIRTIO_F_RING_PACKED,
57     VIRTIO_NET_F_GUEST_ANNOUNCE,
58     VIRTIO_NET_F_STATUS,
59     VHOST_INVALID_FEATURE_BIT
60 };
61 
62 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc)
63 {
64     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
65     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
66     return s->vhost_net;
67 }
68 
69 uint64_t vhost_vdpa_get_acked_features(NetClientState *nc)
70 {
71     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
72     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
73     s->acked_features = vhost_net_get_acked_features(s->vhost_net);
74 
75     return s->acked_features;
76 }
77 
78 static int vhost_vdpa_net_check_device_id(struct vhost_net *net)
79 {
80     uint32_t device_id;
81     int ret;
82     struct vhost_dev *hdev;
83 
84     hdev = (struct vhost_dev *)&net->dev;
85     ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id);
86     if (device_id != VIRTIO_ID_NET) {
87         return -ENOTSUP;
88     }
89     return ret;
90 }
91 
92 static void vhost_vdpa_del(NetClientState *ncs)
93 {
94     VhostVDPAState *s;
95     assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
96     s = DO_UPCAST(VhostVDPAState, nc, ncs);
97     if (s->vhost_net) {
98         vhost_net_cleanup(s->vhost_net);
99     }
100 }
101 
102 static int vhost_vdpa_add(NetClientState *ncs, void *be)
103 {
104     VhostNetOptions options;
105     struct vhost_net *net = NULL;
106     VhostVDPAState *s;
107     int ret;
108 
109     options.backend_type = VHOST_BACKEND_TYPE_VDPA;
110     assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
111     s = DO_UPCAST(VhostVDPAState, nc, ncs);
112     options.net_backend = ncs;
113     options.opaque      = be;
114     options.busyloop_timeout = 0;
115 
116     net = vhost_net_init(&options);
117     if (!net) {
118         error_report("failed to init vhost_net for queue");
119         goto err;
120     }
121     if (s->vhost_net) {
122         vhost_net_cleanup(s->vhost_net);
123         g_free(s->vhost_net);
124     }
125     s->vhost_net = net;
126     ret = vhost_vdpa_net_check_device_id(net);
127     if (ret) {
128         goto err;
129     }
130     return 0;
131 err:
132     if (net) {
133         vhost_net_cleanup(net);
134     }
135     vhost_vdpa_del(ncs);
136     return -1;
137 }
138 
139 static void vhost_vdpa_cleanup(NetClientState *nc)
140 {
141     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
142 
143     if (s->vhost_net) {
144         vhost_net_cleanup(s->vhost_net);
145         g_free(s->vhost_net);
146         s->vhost_net = NULL;
147     }
148      if (s->vhost_vdpa.device_fd >= 0) {
149         qemu_close(s->vhost_vdpa.device_fd);
150         s->vhost_vdpa.device_fd = -1;
151     }
152 }
153 
154 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
155 {
156     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
157 
158     return true;
159 }
160 
161 static bool vhost_vdpa_has_ufo(NetClientState *nc)
162 {
163     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
164     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
165     uint64_t features = 0;
166     features |= (1ULL << VIRTIO_NET_F_HOST_UFO);
167     features = vhost_net_get_features(s->vhost_net, features);
168     return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));
169 
170 }
171 
172 static NetClientInfo net_vhost_vdpa_info = {
173         .type = NET_CLIENT_DRIVER_VHOST_VDPA,
174         .size = sizeof(VhostVDPAState),
175         .cleanup = vhost_vdpa_cleanup,
176         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
177         .has_ufo = vhost_vdpa_has_ufo,
178 };
179 
180 static int net_vhost_vdpa_init(NetClientState *peer, const char *device,
181                                const char *name, const char *vhostdev)
182 {
183     NetClientState *nc = NULL;
184     VhostVDPAState *s;
185     int vdpa_device_fd = -1;
186     int ret = 0;
187     assert(name);
188     nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name);
189     snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
190     nc->queue_index = 0;
191     s = DO_UPCAST(VhostVDPAState, nc, nc);
192     vdpa_device_fd = qemu_open_old(vhostdev, O_RDWR);
193     if (vdpa_device_fd == -1) {
194         return -errno;
195     }
196     s->vhost_vdpa.device_fd = vdpa_device_fd;
197     ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa);
198     assert(s->vhost_net);
199     return ret;
200 }
201 
202 static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
203 {
204     const char *name = opaque;
205     const char *driver, *netdev;
206 
207     driver = qemu_opt_get(opts, "driver");
208     netdev = qemu_opt_get(opts, "netdev");
209     if (!driver || !netdev) {
210         return 0;
211     }
212     if (strcmp(netdev, name) == 0 &&
213         !g_str_has_prefix(driver, "virtio-net-")) {
214         error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
215         return -1;
216     }
217     return 0;
218 }
219 
220 int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
221                         NetClientState *peer, Error **errp)
222 {
223     const NetdevVhostVDPAOptions *opts;
224 
225     assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
226     opts = &netdev->u.vhost_vdpa;
227     /* verify net frontend */
228     if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
229                           (char *)name, errp)) {
230         return -1;
231     }
232     return net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, opts->vhostdev);
233 }
234