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     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 }