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_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 }