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