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 static NetClientInfo net_vhost_vdpa_info = { 174 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 175 .size = sizeof(VhostVDPAState), 176 .cleanup = vhost_vdpa_cleanup, 177 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 178 .has_ufo = vhost_vdpa_has_ufo, 179 .check_peer_type = vhost_vdpa_check_peer_type, 180 }; 181 182 static NetClientState *net_vhost_vdpa_init(NetClientState *peer, 183 const char *device, 184 const char *name, 185 int vdpa_device_fd, 186 int queue_pair_index, 187 int nvqs, 188 bool is_datapath) 189 { 190 NetClientState *nc = NULL; 191 VhostVDPAState *s; 192 int ret = 0; 193 assert(name); 194 if (is_datapath) { 195 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, 196 name); 197 } else { 198 nc = qemu_new_net_control_client(&net_vhost_vdpa_info, peer, 199 device, name); 200 } 201 snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA); 202 s = DO_UPCAST(VhostVDPAState, nc, nc); 203 204 s->vhost_vdpa.device_fd = vdpa_device_fd; 205 s->vhost_vdpa.index = queue_pair_index; 206 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); 207 if (ret) { 208 qemu_del_net_client(nc); 209 return NULL; 210 } 211 return nc; 212 } 213 214 static int vhost_vdpa_get_max_queue_pairs(int fd, int *has_cvq, Error **errp) 215 { 216 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 217 struct vhost_vdpa_config *config; 218 __virtio16 *max_queue_pairs; 219 uint64_t features; 220 int ret; 221 222 ret = ioctl(fd, VHOST_GET_FEATURES, &features); 223 if (ret) { 224 error_setg(errp, "Fail to query features from vhost-vDPA device"); 225 return ret; 226 } 227 228 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { 229 *has_cvq = 1; 230 } else { 231 *has_cvq = 0; 232 } 233 234 if (features & (1 << VIRTIO_NET_F_MQ)) { 235 config = g_malloc0(config_size + sizeof(*max_queue_pairs)); 236 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); 237 config->len = sizeof(*max_queue_pairs); 238 239 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); 240 if (ret) { 241 error_setg(errp, "Fail to get config from vhost-vDPA device"); 242 return -ret; 243 } 244 245 max_queue_pairs = (__virtio16 *)&config->buf; 246 247 return lduw_le_p(max_queue_pairs); 248 } 249 250 return 1; 251 } 252 253 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 254 NetClientState *peer, Error **errp) 255 { 256 const NetdevVhostVDPAOptions *opts; 257 int vdpa_device_fd; 258 NetClientState **ncs, *nc; 259 int queue_pairs, i, has_cvq = 0; 260 261 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 262 opts = &netdev->u.vhost_vdpa; 263 264 vdpa_device_fd = qemu_open_old(opts->vhostdev, O_RDWR); 265 if (vdpa_device_fd == -1) { 266 return -errno; 267 } 268 269 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, 270 &has_cvq, errp); 271 if (queue_pairs < 0) { 272 qemu_close(vdpa_device_fd); 273 return queue_pairs; 274 } 275 276 ncs = g_malloc0(sizeof(*ncs) * queue_pairs); 277 278 for (i = 0; i < queue_pairs; i++) { 279 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 280 vdpa_device_fd, i, 2, true); 281 if (!ncs[i]) 282 goto err; 283 } 284 285 if (has_cvq) { 286 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 287 vdpa_device_fd, i, 1, false); 288 if (!nc) 289 goto err; 290 } 291 292 g_free(ncs); 293 return 0; 294 295 err: 296 if (i) { 297 qemu_del_net_client(ncs[0]); 298 } 299 qemu_close(vdpa_device_fd); 300 g_free(ncs); 301 302 return -1; 303 } 304