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     VIRTIO_NET_F_STATUS,
  59     VHOST_INVALID_FEATURE_BIT
  60 };
  61
  62 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc)
  63 {
  64     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
  65     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
  66     return s->vhost_net;
  67 }
  68
  69 uint64_t vhost_vdpa_get_acked_features(NetClientState *nc)
  70 {
  71     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
  72     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
  73     s->acked_features = vhost_net_get_acked_features(s->vhost_net);
  74
  75     return s->acked_features;
  76 }
  77
  78 static int vhost_vdpa_net_check_device_id(struct vhost_net *net)
  79 {
  80     uint32_t device_id;
  81     int ret;
  82     struct vhost_dev *hdev;
  83
  84     hdev = (struct vhost_dev *)&net->dev;
  85     ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id);
  86     if (device_id != VIRTIO_ID_NET) {
  87         return -ENOTSUP;
  88     }
  89     return ret;
  90 }
  91
  92 static void vhost_vdpa_del(NetClientState *ncs)
  93 {
  94     VhostVDPAState *s;
  95     assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
  96     s = DO_UPCAST(VhostVDPAState, nc, ncs);
  97     if (s->vhost_net) {
  98         vhost_net_cleanup(s->vhost_net);
  99     }
 100 }
 101
 102 static int vhost_vdpa_add(NetClientState *ncs, void *be)
 103 {
 104     VhostNetOptions options;
 105     struct vhost_net *net = NULL;
 106     VhostVDPAState *s;
 107     int ret;
 108
 109     options.backend_type = VHOST_BACKEND_TYPE_VDPA;
 110     assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 111     s = DO_UPCAST(VhostVDPAState, nc, ncs);
 112     options.net_backend = ncs;
 113     options.opaque      = be;
 114     options.busyloop_timeout = 0;
 115
 116     net = vhost_net_init(&options);
 117     if (!net) {
 118         error_report("failed to init vhost_net for queue");
 119         goto err;
 120     }
 121     if (s->vhost_net) {
 122         vhost_net_cleanup(s->vhost_net);
 123         g_free(s->vhost_net);
 124     }
 125     s->vhost_net = net;
 126     ret = vhost_vdpa_net_check_device_id(net);
 127     if (ret) {
 128         goto err;
 129     }
 130     return 0;
 131 err:
 132     if (net) {
 133         vhost_net_cleanup(net);
 134     }
 135     vhost_vdpa_del(ncs);
 136     return -1;
 137 }
 138
 139 static void vhost_vdpa_cleanup(NetClientState *nc)
 140 {
 141     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
 142
 143     if (s->vhost_net) {
 144         vhost_net_cleanup(s->vhost_net);
 145         g_free(s->vhost_net);
 146         s->vhost_net = NULL;
 147     }
 148      if (s->vhost_vdpa.device_fd >= 0) {
 149         qemu_close(s->vhost_vdpa.device_fd);
 150         s->vhost_vdpa.device_fd = -1;
 151     }
 152 }
 153
 154 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
 155 {
 156     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 157
 158     return true;
 159 }
 160
 161 static bool vhost_vdpa_has_ufo(NetClientState *nc)
 162 {
 163     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 164     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
 165     uint64_t features = 0;
 166     features |= (1ULL << VIRTIO_NET_F_HOST_UFO);
 167     features = vhost_net_get_features(s->vhost_net, features);
 168     return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));
 169
 170 }
 171
 172 static NetClientInfo net_vhost_vdpa_info = {
 173         .type = NET_CLIENT_DRIVER_VHOST_VDPA,
 174         .size = sizeof(VhostVDPAState),
 175         .cleanup = vhost_vdpa_cleanup,
 176         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
 177         .has_ufo = vhost_vdpa_has_ufo,
 178 };
 179
 180 static int net_vhost_vdpa_init(NetClientState *peer, const char *device,
 181                                const char *name, const char *vhostdev)
 182 {
 183     NetClientState *nc = NULL;
 184     VhostVDPAState *s;
 185     int vdpa_device_fd = -1;
 186     int ret = 0;
 187     assert(name);
 188     nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name);
 189     snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
 190     nc->queue_index = 0;
 191     s = DO_UPCAST(VhostVDPAState, nc, nc);
 192     vdpa_device_fd = qemu_open_old(vhostdev, O_RDWR);
 193     if (vdpa_device_fd == -1) {
 194         return -errno;
 195     }
 196     s->vhost_vdpa.device_fd = vdpa_device_fd;
 197     ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa);
 198     assert(s->vhost_net);
 199     return ret;
 200 }
 201
 202 static int net_vhost_check_net(void *opaque, QemuOpts *opts, Error **errp)
 203 {
 204     const char *name = opaque;
 205     const char *driver, *netdev;
 206
 207     driver = qemu_opt_get(opts, "driver");
 208     netdev = qemu_opt_get(opts, "netdev");
 209     if (!driver || !netdev) {
 210         return 0;
 211     }
 212     if (strcmp(netdev, name) == 0 &&
 213         !g_str_has_prefix(driver, "virtio-net-")) {
 214         error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
 215         return -1;
 216     }
 217     return 0;
 218 }
 219
 220 int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
 221                         NetClientState *peer, Error **errp)
 222 {
 223     const NetdevVhostVDPAOptions *opts;
 224
 225     assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 226     opts = &netdev->u.vhost_vdpa;
 227     /* verify net frontend */
 228     if (qemu_opts_foreach(qemu_find_opts("device"), net_vhost_check_net,
 229                           (char *)name, errp)) {
 230         return -1;
 231     }
 232     return net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, opts->vhostdev);
 233 }