Merge remote-tracking branch 'remotes/alistair23/tags/pull-riscv-to-apply-20210921...
[qemu.git] / net / vhost-vdpa.c
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 bool started;
33 } VhostVDPAState;
34
35 const int vdpa_feature_bits[] = {
36 VIRTIO_F_NOTIFY_ON_EMPTY,
37 VIRTIO_RING_F_INDIRECT_DESC,
38 VIRTIO_RING_F_EVENT_IDX,
39 VIRTIO_F_ANY_LAYOUT,
40 VIRTIO_F_VERSION_1,
41 VIRTIO_NET_F_CSUM,
42 VIRTIO_NET_F_GUEST_CSUM,
43 VIRTIO_NET_F_GSO,
44 VIRTIO_NET_F_GUEST_TSO4,
45 VIRTIO_NET_F_GUEST_TSO6,
46 VIRTIO_NET_F_GUEST_ECN,
47 VIRTIO_NET_F_GUEST_UFO,
48 VIRTIO_NET_F_HOST_TSO4,
49 VIRTIO_NET_F_HOST_TSO6,
50 VIRTIO_NET_F_HOST_ECN,
51 VIRTIO_NET_F_HOST_UFO,
52 VIRTIO_NET_F_MRG_RXBUF,
53 VIRTIO_NET_F_MTU,
54 VIRTIO_F_IOMMU_PLATFORM,
55 VIRTIO_F_RING_PACKED,
56 VIRTIO_NET_F_RSS,
57 VIRTIO_NET_F_HASH_REPORT,
58 VIRTIO_NET_F_GUEST_ANNOUNCE,
59 VIRTIO_NET_F_STATUS,
60 VHOST_INVALID_FEATURE_BIT
61 };
62
63 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc)
64 {
65 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
66 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
67 return s->vhost_net;
68 }
69
70 static int vhost_vdpa_net_check_device_id(struct vhost_net *net)
71 {
72 uint32_t device_id;
73 int ret;
74 struct vhost_dev *hdev;
75
76 hdev = (struct vhost_dev *)&net->dev;
77 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id);
78 if (device_id != VIRTIO_ID_NET) {
79 return -ENOTSUP;
80 }
81 return ret;
82 }
83
84 static int vhost_vdpa_add(NetClientState *ncs, void *be)
85 {
86 VhostNetOptions options;
87 struct vhost_net *net = NULL;
88 VhostVDPAState *s;
89 int ret;
90
91 options.backend_type = VHOST_BACKEND_TYPE_VDPA;
92 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
93 s = DO_UPCAST(VhostVDPAState, nc, ncs);
94 options.net_backend = ncs;
95 options.opaque = be;
96 options.busyloop_timeout = 0;
97 options.nvqs = 2;
98
99 net = vhost_net_init(&options);
100 if (!net) {
101 error_report("failed to init vhost_net for queue");
102 goto err_init;
103 }
104 s->vhost_net = net;
105 ret = vhost_vdpa_net_check_device_id(net);
106 if (ret) {
107 goto err_check;
108 }
109 return 0;
110 err_check:
111 vhost_net_cleanup(net);
112 g_free(net);
113 err_init:
114 return -1;
115 }
116
117 static void vhost_vdpa_cleanup(NetClientState *nc)
118 {
119 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
120
121 if (s->vhost_net) {
122 vhost_net_cleanup(s->vhost_net);
123 g_free(s->vhost_net);
124 s->vhost_net = NULL;
125 }
126 if (s->vhost_vdpa.device_fd >= 0) {
127 qemu_close(s->vhost_vdpa.device_fd);
128 s->vhost_vdpa.device_fd = -1;
129 }
130 }
131
132 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
133 {
134 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
135
136 return true;
137 }
138
139 static bool vhost_vdpa_has_ufo(NetClientState *nc)
140 {
141 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
142 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
143 uint64_t features = 0;
144 features |= (1ULL << VIRTIO_NET_F_HOST_UFO);
145 features = vhost_net_get_features(s->vhost_net, features);
146 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));
147
148 }
149
150 static NetClientInfo net_vhost_vdpa_info = {
151 .type = NET_CLIENT_DRIVER_VHOST_VDPA,
152 .size = sizeof(VhostVDPAState),
153 .cleanup = vhost_vdpa_cleanup,
154 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
155 .has_ufo = vhost_vdpa_has_ufo,
156 };
157
158 static int net_vhost_vdpa_init(NetClientState *peer, const char *device,
159 const char *name, const char *vhostdev)
160 {
161 NetClientState *nc = NULL;
162 VhostVDPAState *s;
163 int vdpa_device_fd = -1;
164 int ret = 0;
165 assert(name);
166 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name);
167 snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
168 s = DO_UPCAST(VhostVDPAState, nc, nc);
169 vdpa_device_fd = qemu_open_old(vhostdev, O_RDWR);
170 if (vdpa_device_fd == -1) {
171 return -errno;
172 }
173 s->vhost_vdpa.device_fd = vdpa_device_fd;
174 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa);
175 if (ret) {
176 qemu_close(vdpa_device_fd);
177 qemu_del_net_client(nc);
178 }
179 return ret;
180 }
181
182 static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
183 {
184 const char *name = opaque;
185 const char *driver, *netdev;
186
187 driver = qemu_opt_get(opts, "driver");
188 netdev = qemu_opt_get(opts, "netdev");
189 if (!driver || !netdev) {
190 return 0;
191 }
192 if (strcmp(netdev, name) == 0 &&
193 !g_str_has_prefix(driver, "virtio-net-")) {
194 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
195 return -1;
196 }
197 return 0;
198 }
199
200 int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
201 NetClientState *peer, Error **errp)
202 {
203 const NetdevVhostVDPAOptions *opts;
204
205 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
206 opts = &netdev->u.vhost_vdpa;
207 /* verify net frontend */
208 if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
209 (char *)name, errp)) {
210 return -1;
211 }
212 return net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, opts->vhostdev);
213 }