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