Michael S. Tsirkin
2022-Mar-08 07:11 UTC
[PATCH v5 15/15] vdpa: Add x-svq to NetdevVhostVDPAOptions
On Mon, Mar 07, 2022 at 04:33:34PM +0100, Eugenio P?rez wrote:> Finally offering the possibility to enable SVQ from the command line. > > Signed-off-by: Eugenio P?rez <eperezma at redhat.com> > --- > qapi/net.json | 8 +++++++- > net/vhost-vdpa.c | 48 ++++++++++++++++++++++++++++++++++++++++-------- > 2 files changed, 47 insertions(+), 9 deletions(-) > > diff --git a/qapi/net.json b/qapi/net.json > index 7fab2e7cd8..d626fa441c 100644 > --- a/qapi/net.json > +++ b/qapi/net.json > @@ -445,12 +445,18 @@ > # @queues: number of queues to be created for multiqueue vhost-vdpa > # (default: 1) > # > +# @svq: Start device with (experimental) shadow virtqueue. (Since 7.0) > +# > +# Features: > +# @unstable: Member @svq is experimental. > +# > # Since: 5.1 > ## > { 'struct': 'NetdevVhostVDPAOptions', > 'data': { > '*vhostdev': 'str', > - '*queues': 'int' } } > + '*queues': 'int', > + '*svq': {'type': 'bool', 'features' : [ 'unstable'] } } } > > ## > # @NetClientDriver:I think this should be x-svq same as other unstable features.> diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c > index 1e9fe47c03..c827921654 100644 > --- a/net/vhost-vdpa.c > +++ b/net/vhost-vdpa.c > @@ -127,7 +127,11 @@ err_init: > static void vhost_vdpa_cleanup(NetClientState *nc) > { > VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); > + struct vhost_dev *dev = s->vhost_vdpa.dev; > > + if (dev && dev->vq_index + dev->nvqs == dev->vq_index_end) { > + g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); > + } > if (s->vhost_net) { > vhost_net_cleanup(s->vhost_net); > g_free(s->vhost_net); > @@ -187,13 +191,23 @@ static NetClientInfo net_vhost_vdpa_info = { > .check_peer_type = vhost_vdpa_check_peer_type, > }; > > +static int vhost_vdpa_get_iova_range(int fd, > + struct vhost_vdpa_iova_range *iova_range) > +{ > + int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range); > + > + return ret < 0 ? -errno : 0; > +} > + > static NetClientState *net_vhost_vdpa_init(NetClientState *peer, > - const char *device, > - const char *name, > - int vdpa_device_fd, > - int queue_pair_index, > - int nvqs, > - bool is_datapath) > + const char *device, > + const char *name, > + int vdpa_device_fd, > + int queue_pair_index, > + int nvqs, > + bool is_datapath, > + bool svq, > + VhostIOVATree *iova_tree) > { > NetClientState *nc = NULL; > VhostVDPAState *s; > @@ -211,6 +225,8 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer, > > s->vhost_vdpa.device_fd = vdpa_device_fd; > s->vhost_vdpa.index = queue_pair_index; > + s->vhost_vdpa.shadow_vqs_enabled = svq; > + s->vhost_vdpa.iova_tree = iova_tree; > ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); > if (ret) { > qemu_del_net_client(nc); > @@ -266,6 +282,7 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, > g_autofree NetClientState **ncs = NULL; > NetClientState *nc; > int queue_pairs, i, has_cvq = 0; > + g_autoptr(VhostIOVATree) iova_tree = NULL; > > assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); > opts = &netdev->u.vhost_vdpa; > @@ -285,29 +302,44 @@ int net_init_vhost_vdpa(const Netdev *netdev, const char *name, > qemu_close(vdpa_device_fd); > return queue_pairs; > } > + if (opts->svq) { > + struct vhost_vdpa_iova_range iova_range; > + > + if (has_cvq) { > + error_setg(errp, "vdpa svq does not work with cvq"); > + goto err_svq; > + } > + vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); > + iova_tree = vhost_iova_tree_new(iova_range.first, iova_range.last); > + } > > ncs = g_malloc0(sizeof(*ncs) * queue_pairs); > > for (i = 0; i < queue_pairs; i++) { > ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, > - vdpa_device_fd, i, 2, true); > + vdpa_device_fd, i, 2, true, opts->svq, > + iova_tree); > if (!ncs[i]) > goto err; > } > > if (has_cvq) { > nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, > - vdpa_device_fd, i, 1, false); > + vdpa_device_fd, i, 1, false, opts->svq, > + iova_tree); > if (!nc) > goto err; > } > > + iova_tree = NULL; > return 0; > > err: > if (i) { > qemu_del_net_client(ncs[0]); > } > + > +err_svq: > qemu_close(vdpa_device_fd); > > return -1; > -- > 2.27.0