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 void vhost_vdpa_del(NetClientState *ncs) 85 { 86 VhostVDPAState *s; 87 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 88 s = DO_UPCAST(VhostVDPAState, nc, ncs); 89 if (s->vhost_net) { 90 vhost_net_cleanup(s->vhost_net); 91 } 92 } 93 94 static int vhost_vdpa_add(NetClientState *ncs, void *be) 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; 107 108 net = vhost_net_init(&options); 109 if (!net) { 110 error_report("failed to init vhost_net for queue"); 111 goto err; 112 } 113 if (s->vhost_net) { 114 vhost_net_cleanup(s->vhost_net); 115 g_free(s->vhost_net); 116 } 117 s->vhost_net = net; 118 ret = vhost_vdpa_net_check_device_id(net); 119 if (ret) { 120 goto err; 121 } 122 return 0; 123 err: 124 if (net) { 125 vhost_net_cleanup(net); 126 } 127 vhost_vdpa_del(ncs); 128 return -1; 129 } 130 131 static void vhost_vdpa_cleanup(NetClientState *nc) 132 { 133 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 134 135 if (s->vhost_net) { 136 vhost_net_cleanup(s->vhost_net); 137 g_free(s->vhost_net); 138 s->vhost_net = NULL; 139 } 140 if (s->vhost_vdpa.device_fd >= 0) { 141 qemu_close(s->vhost_vdpa.device_fd); 142 s->vhost_vdpa.device_fd = -1; 143 } 144 } 145 146 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) 147 { 148 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 149 150 return true; 151 } 152 153 static bool vhost_vdpa_has_ufo(NetClientState *nc) 154 { 155 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 156 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 157 uint64_t features = 0; 158 features |= (1ULL << VIRTIO_NET_F_HOST_UFO); 159 features = vhost_net_get_features(s->vhost_net, features); 160 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); 161 162 } 163 164 static NetClientInfo net_vhost_vdpa_info = { 165 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 166 .size = sizeof(VhostVDPAState), 167 .cleanup = vhost_vdpa_cleanup, 168 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 169 .has_ufo = vhost_vdpa_has_ufo, 170 }; 171 172 static int net_vhost_vdpa_init(NetClientState *peer, const char *device, 173 const char *name, const char *vhostdev) 174 { 175 NetClientState *nc = NULL; 176 VhostVDPAState *s; 177 int vdpa_device_fd = -1; 178 int ret = 0; 179 assert(name); 180 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name); 181 snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA); 182 nc->queue_index = 0; 183 s = DO_UPCAST(VhostVDPAState, nc, nc); 184 vdpa_device_fd = qemu_open_old(vhostdev, O_RDWR); 185 if (vdpa_device_fd == -1) { 186 return -errno; 187 } 188 s->vhost_vdpa.device_fd = vdpa_device_fd; 189 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa); 190 assert(s->vhost_net); 191 return ret; 192 } 193 194 static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp) 195 { 196 const char *name = opaque; 197 const char *driver, *netdev; 198 199 driver = qemu_opt_get(opts, "driver"); 200 netdev = qemu_opt_get(opts, "netdev"); 201 if (!driver || !netdev) { 202 return 0; 203 } 204 if (strcmp(netdev, name) == 0 && 205 !g_str_has_prefix(driver, "virtio-net-")) { 206 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); 207 return -1; 208 } 209 return 0; 210 } 211 212 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 213 NetClientState *peer, Error **errp) 214 { 215 const NetdevVhostVDPAOptions *opts; 216 217 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 218 opts = &netdev->u.vhost_vdpa; 219 /* verify net frontend */ 220 if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net, 221 (char *)name, errp)) { 222 return -1; 223 } 224 return net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, opts->vhostdev); 225 } 226