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     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 int vhost_vdpa_add(NetClientState *ncs, void *be)
  85 {
  86     VhostNetOptions options;
  87     struct vhost_net *net = NULL;
  88     VhostVDPAState *s;
  89     int ret;
  90
  91     options.backend_type = VHOST_BACKEND_TYPE_VDPA;
  92     assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
  93     s = DO_UPCAST(VhostVDPAState, nc, ncs);
  94     options.net_backend = ncs;
  95     options.opaque      = be;
  96     options.busyloop_timeout = 0;
  97     options.nvqs = 2;
  98
  99     net = vhost_net_init(&options);
 100     if (!net) {
 101         error_report("failed to init vhost_net for queue");
 102         goto err_init;
 103     }
 104     s->vhost_net = net;
 105     ret = vhost_vdpa_net_check_device_id(net);
 106     if (ret) {
 107         goto err_check;
 108     }
 109     return 0;
 110 err_check:
 111     vhost_net_cleanup(net);
 112     g_free(net);
 113 err_init:
 114     return -1;
 115 }
 116
 117 static void vhost_vdpa_cleanup(NetClientState *nc)
 118 {
 119     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
 120
 121     if (s->vhost_net) {
 122         vhost_net_cleanup(s->vhost_net);
 123         g_free(s->vhost_net);
 124         s->vhost_net = NULL;
 125     }
 126      if (s->vhost_vdpa.device_fd >= 0) {
 127         qemu_close(s->vhost_vdpa.device_fd);
 128         s->vhost_vdpa.device_fd = -1;
 129     }
 130 }
 131
 132 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc)
 133 {
 134     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 135
 136     return true;
 137 }
 138
 139 static bool vhost_vdpa_has_ufo(NetClientState *nc)
 140 {
 141     assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 142     VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc);
 143     uint64_t features = 0;
 144     features |= (1ULL << VIRTIO_NET_F_HOST_UFO);
 145     features = vhost_net_get_features(s->vhost_net, features);
 146     return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO));
 147
 148 }
 149
 150 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc,
 151                                        Error **errp)
 152 {
 153     const char *driver = object_class_get_name(oc);
 154
 155     if (!g_str_has_prefix(driver, "virtio-net-")) {
 156         error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*");
 157         return false;
 158     }
 159
 160     return true;
 161 }
 162
 163 static NetClientInfo net_vhost_vdpa_info = {
 164         .type = NET_CLIENT_DRIVER_VHOST_VDPA,
 165         .size = sizeof(VhostVDPAState),
 166         .cleanup = vhost_vdpa_cleanup,
 167         .has_vnet_hdr = vhost_vdpa_has_vnet_hdr,
 168         .has_ufo = vhost_vdpa_has_ufo,
 169         .check_peer_type = vhost_vdpa_check_peer_type,
 170 };
 171
 172 static int net_vhost_vdpa_init(NetClientState *peer, const char *device,
 173                                const char *name, int vdpa_device_fd)
 174 {
 175     NetClientState *nc = NULL;
 176     VhostVDPAState *s;
 177     int ret = 0;
 178     assert(name);
 179     nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, name);
 180     snprintf(nc->info_str, sizeof(nc->info_str), TYPE_VHOST_VDPA);
 181     s = DO_UPCAST(VhostVDPAState, nc, nc);
 182
 183     s->vhost_vdpa.device_fd = vdpa_device_fd;
 184     ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa);
 185     if (ret) {
 186         qemu_del_net_client(nc);
 187     }
 188     return ret;
 189 }
 190
 191 int net_init_vhost_vdpa(const Netdev *netdev, const char *name,
 192                         NetClientState *peer, Error **errp)
 193 {
 194     const NetdevVhostVDPAOptions *opts;
 195     int vdpa_device_fd, ret;
 196
 197     assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA);
 198     opts = &netdev->u.vhost_vdpa;
 199
 200     vdpa_device_fd = qemu_open_old(opts->vhostdev, O_RDWR);
 201     if (vdpa_device_fd == -1) {
 202         return -errno;
 203     }
 204
 205     ret = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, vdpa_device_fd);
 206     if (ret) {
 207         qemu_close(vdpa_device_fd);
 208     }
 209
 210     return ret;
 211 }