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Re: [PATCH V2 17/21] vhost-net: control virtqueue support
From: |
Jason Wang |
Subject: |
Re: [PATCH V2 17/21] vhost-net: control virtqueue support |
Date: |
Mon, 6 Sep 2021 11:43:34 +0800 |
On Sun, Sep 5, 2021 at 4:40 AM Michael S. Tsirkin <mst@redhat.com> wrote:
>
> On Fri, Sep 03, 2021 at 05:10:27PM +0800, Jason Wang wrote:
> > We assume there's no cvq in the past, this is not true when we need
> > control virtqueue support for vhost-user backends. So this patch
> > implements the control virtqueue support for vhost-net. As datapath,
> > the control virtqueue is also required to be coupled with the
> > NetClientState. The vhost_net_start/stop() are tweaked to accept the
> > number of datapath queue pairs plus the the number of control
> > virtqueue for us to start and stop the vhost device.
> >
> > Signed-off-by: Jason Wang <jasowang@redhat.com>
>
>
> Fails build:
>
> FAILED: libcommon.fa.p/hw_net_vhost_net-stub.c.o
> cc -Ilibcommon.fa.p -I. -Iqapi -Itrace -Iui -Iui/shader
> -I/usr/include/spice-1 -I/usr/include/spice-server -I/usr/include/cacard
> -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/nss3
> -I/usr/include/nspr4 -I/usr/include/libmount -I/usr/include/blkid
> -I/usr/include/pixman-1 -I/usr/include/p11-kit-1 -I/usr/include/SDL2
> -I/usr/include/libpng16 -I/usr/include/virgl -I/usr/include/libusb-1.0
> -I/usr/include/slirp -I/usr/include/gtk-3.0 -I/usr/include/pango-1.0
> -I/usr/include/harfbuzz -I/usr/include/freetype2 -I/usr/include/fribidi
> -I/usr/include/libxml2 -I/usr/include/cairo -I/usr/include/gdk-pixbuf-2.0
> -I/usr/include/gio-unix-2.0 -I/usr/include/atk-1.0
> -I/usr/include/at-spi2-atk/2.0 -I/usr/include/dbus-1.0
> -I/usr/lib64/dbus-1.0/include -I/usr/include/at-spi-2.0
> -I/usr/include/vte-2.91 -I/usr/include/capstone -fdiagnostics-color=auto
> -pipe -Wall -Winvalid-pch -Werror -std=gnu11 -O2 -g -isystem
> /scm/qemu/linux-headers -isystem linux-headers -iquote . -iquote /scm/qemu
> -iquote /scm/qemu/include -iquote /scm/qemu/disas/libvixl -iquote
> /scm/qemu/tcg/i386 -pthread -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -m64 -mcx16
> -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes
> -Wredundant-decls -Wundef -Wwrite-strings -Wmissing-prototypes
> -fno-strict-aliasing -fno-common -fwrapv -Wold-style-declaration
> -Wold-style-definition -Wtype-limits -Wformat-security -Wformat-y2k
> -Winit-self -Wignored-qualifiers -Wempty-body -Wnested-externs -Wendif-labels
> -Wexpansion-to-defined -Wimplicit-fallthrough=2 -Wno-missing-include-dirs
> -Wno-shift-negative-value -Wno-psabi -fstack-protector-strong -fPIC
> -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -DNCURSES_WIDECHAR
> -DSTRUCT_IOVEC_DEFINED -D_REENTRANT -Wno-undef -MD -MQ
> libcommon.fa.p/hw_net_vhost_net-stub.c.o -MF
> libcommon.fa.p/hw_net_vhost_net-stub.c.o.d -o
> libcommon.fa.p/hw_net_vhost_net-stub.c.o -c ../hw/net/vhost_net-stub.c
> ../hw/net/vhost_net-stub.c:34:5: error: conflicting types for
> ‘vhost_net_start’
> 34 | int vhost_net_start(VirtIODevice *dev,
> | ^~~~~~~~~~~~~~~
> In file included from ../hw/net/vhost_net-stub.c:19:
> /scm/qemu/include/net/vhost_net.h:24:5: note: previous declaration of
> ‘vhost_net_start’ was here
> 24 | int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
> | ^~~~~~~~~~~~~~~
> ../hw/net/vhost_net-stub.c:40:6: error: conflicting types for ‘vhost_net_stop’
> 40 | void vhost_net_stop(VirtIODevice *dev,
> | ^~~~~~~~~~~~~~
> In file included from ../hw/net/vhost_net-stub.c:19:
> /scm/qemu/include/net/vhost_net.h:26:6: note: previous declaration of
> ‘vhost_net_stop’ was here
> 26 | void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
> | ^~~~~~~~~~~~~~
> ninja: build stopped: subcommand failed.
> make[1]: *** [Makefile:156: run-ninja] Error 1
Will fix this.
Thanks
>
>
>
> > ---
> > hw/net/vhost_net.c | 43 ++++++++++++++++++++++++++++++-----------
> > hw/net/virtio-net.c | 4 ++--
> > include/net/vhost_net.h | 6 ++++--
> > 3 files changed, 38 insertions(+), 15 deletions(-)
> >
> > diff --git a/hw/net/vhost_net.c b/hw/net/vhost_net.c
> > index 386ec2eaa2..7e0b60b4d9 100644
> > --- a/hw/net/vhost_net.c
> > +++ b/hw/net/vhost_net.c
> > @@ -315,11 +315,14 @@ static void vhost_net_stop_one(struct vhost_net *net,
> > }
> >
> > int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
> > - int total_queues)
> > + int data_qps, int cvq)
> > {
> > BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
> > VirtioBusState *vbus = VIRTIO_BUS(qbus);
> > VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
> > + int total_notifiers = data_qps * 2 + cvq;
> > + VirtIONet *n = VIRTIO_NET(dev);
> > + int nvhosts = data_qps + cvq;
> > struct vhost_net *net;
> > int r, e, i;
> > NetClientState *peer;
> > @@ -329,9 +332,14 @@ int vhost_net_start(VirtIODevice *dev, NetClientState
> > *ncs,
> > return -ENOSYS;
> > }
> >
> > - for (i = 0; i < total_queues; i++) {
> > + for (i = 0; i < nvhosts; i++) {
> > +
> > + if (i < data_qps) {
> > + peer = qemu_get_peer(ncs, i);
> > + } else { /* Control Virtqueue */
> > + peer = qemu_get_peer(ncs, n->max_queues);
> > + }
> >
> > - peer = qemu_get_peer(ncs, i);
> > net = get_vhost_net(peer);
> > vhost_net_set_vq_index(net, i * 2);
> >
> > @@ -344,14 +352,18 @@ int vhost_net_start(VirtIODevice *dev, NetClientState
> > *ncs,
> > }
> > }
> >
> > - r = k->set_guest_notifiers(qbus->parent, total_queues * 2, true);
> > + r = k->set_guest_notifiers(qbus->parent, total_notifiers, true);
> > if (r < 0) {
> > error_report("Error binding guest notifier: %d", -r);
> > goto err;
> > }
> >
> > - for (i = 0; i < total_queues; i++) {
> > - peer = qemu_get_peer(ncs, i);
> > + for (i = 0; i < nvhosts; i++) {
> > + if (i < data_qps) {
> > + peer = qemu_get_peer(ncs, i);
> > + } else {
> > + peer = qemu_get_peer(ncs, n->max_queues);
> > + }
> > r = vhost_net_start_one(get_vhost_net(peer), dev);
> >
> > if (r < 0) {
> > @@ -375,7 +387,7 @@ err_start:
> > peer = qemu_get_peer(ncs , i);
> > vhost_net_stop_one(get_vhost_net(peer), dev);
> > }
> > - e = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
> > + e = k->set_guest_notifiers(qbus->parent, total_notifiers, false);
> > if (e < 0) {
> > fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", e);
> > fflush(stderr);
> > @@ -385,18 +397,27 @@ err:
> > }
> >
> > void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
> > - int total_queues)
> > + int data_qps, int cvq)
> > {
> > BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(dev)));
> > VirtioBusState *vbus = VIRTIO_BUS(qbus);
> > VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus);
> > + VirtIONet *n = VIRTIO_NET(dev);
> > + NetClientState *peer;
> > + int total_notifiers = data_qps * 2 + cvq;
> > + int nvhosts = data_qps + cvq;
> > int i, r;
> >
> > - for (i = 0; i < total_queues; i++) {
> > - vhost_net_stop_one(get_vhost_net(ncs[i].peer), dev);
> > + for (i = 0; i < nvhosts; i++) {
> > + if (i < data_qps) {
> > + peer = qemu_get_peer(ncs, i);
> > + } else {
> > + peer = qemu_get_peer(ncs, n->max_queues);
> > + }
> > + vhost_net_stop_one(get_vhost_net(peer), dev);
> > }
> >
> > - r = k->set_guest_notifiers(qbus->parent, total_queues * 2, false);
> > + r = k->set_guest_notifiers(qbus->parent, total_notifiers, false);
> > if (r < 0) {
> > fprintf(stderr, "vhost guest notifier cleanup failed: %d\n", r);
> > fflush(stderr);
> > diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c
> > index 16d20cdee5..8fccbaa44c 100644
> > --- a/hw/net/virtio-net.c
> > +++ b/hw/net/virtio-net.c
> > @@ -285,14 +285,14 @@ static void virtio_net_vhost_status(VirtIONet *n,
> > uint8_t status)
> > }
> >
> > n->vhost_started = 1;
> > - r = vhost_net_start(vdev, n->nic->ncs, queues);
> > + r = vhost_net_start(vdev, n->nic->ncs, queues, 0);
> > if (r < 0) {
> > error_report("unable to start vhost net: %d: "
> > "falling back on userspace virtio", -r);
> > n->vhost_started = 0;
> > }
> > } else {
> > - vhost_net_stop(vdev, n->nic->ncs, queues);
> > + vhost_net_stop(vdev, n->nic->ncs, queues, 0);
> > n->vhost_started = 0;
> > }
> > }
> > diff --git a/include/net/vhost_net.h b/include/net/vhost_net.h
> > index fba40cf695..e656e38af9 100644
> > --- a/include/net/vhost_net.h
> > +++ b/include/net/vhost_net.h
> > @@ -21,8 +21,10 @@ typedef struct VhostNetOptions {
> > uint64_t vhost_net_get_max_queues(VHostNetState *net);
> > struct vhost_net *vhost_net_init(VhostNetOptions *options);
> >
> > -int vhost_net_start(VirtIODevice *dev, NetClientState *ncs, int
> > total_queues);
> > -void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs, int
> > total_queues);
> > +int vhost_net_start(VirtIODevice *dev, NetClientState *ncs,
> > + int data_qps, int cvq);
> > +void vhost_net_stop(VirtIODevice *dev, NetClientState *ncs,
> > + int data_qps, int cvq);
> >
> > void vhost_net_cleanup(VHostNetState *net);
> >
> > --
> > 2.25.1
>
- [PATCH V2 10/21] vhost-vdpa: fix the wrong assertion in vhost_vdpa_init(), (continued)
- [PATCH V2 10/21] vhost-vdpa: fix the wrong assertion in vhost_vdpa_init(), Jason Wang, 2021/09/03
- [PATCH V2 11/21] vhost-vdpa: remove the unncessary queue_index assignment, Jason Wang, 2021/09/03
- [PATCH V2 12/21] vhost-vdpa: open device fd in net_init_vhost_vdpa(), Jason Wang, 2021/09/03
- [PATCH V2 13/21] vhost-vdpa: classify one time request, Jason Wang, 2021/09/03
- [PATCH V2 14/21] vhost-vdpa: prepare for the multiqueue support, Jason Wang, 2021/09/03
- [PATCH V2 15/21] vhost-vdpa: let net_vhost_vdpa_init() returns NetClientState *, Jason Wang, 2021/09/03
- [PATCH V2 16/21] net: introduce control client, Jason Wang, 2021/09/03
- [PATCH V2 17/21] vhost-net: control virtqueue support, Jason Wang, 2021/09/03
- [PATCH V2 18/21] virito-net: use "qps" instead of "queues" when possible, Jason Wang, 2021/09/03
[PATCH V2 19/21] vhost: record the last virtqueue index for the virtio device, Jason Wang, 2021/09/03
[PATCH V2 20/21] virtio-net: vhost control virtqueue support, Jason Wang, 2021/09/03
[PATCH V2 21/21] vhost-vdpa: multiqueue support, Jason Wang, 2021/09/03