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Tsirkin" , Harpreet Singh Anand , Laurent Vivier , Shannon Nelson , Lei Yang , Dragos Tatulea Subject: [PATCH 5/7] vdpa: delay enable of data vqs Date: Fri, 28 Jul 2023 19:20:26 +0200 Message-Id: <20230728172028.2074052-6-eperezma@redhat.com> In-Reply-To: <20230728172028.2074052-1-eperezma@redhat.com> References: <20230728172028.2074052-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Received-SPF: pass client-ip=170.10.133.124; envelope-from=eperezma@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org To restore the device at the destination of a live migration we send the commands through control virtqueue. For a device to read CVQ it must have received the DRIVER_OK status bit. However this opens a window where the device could start receiving packets in rx queue 0 before it receives the RSS configuration. To avoid that, we do not send vring_enable until all configuration is used by the device. Signed-off-by: Eugenio Pérez --- v2: Enable the dataplane vqs if cannot shadow CVQ because of device features or ASID. --- net/vhost-vdpa.c | 44 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 43 insertions(+), 1 deletion(-) diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index 3d7dc3e5c0..2c1cfda657 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -283,6 +283,15 @@ static VhostVDPAState *vhost_vdpa_net_first_nc_vdpa(VhostVDPAState *s) return DO_UPCAST(VhostVDPAState, nc, nc0); } +/** From any vdpa net client, get the netclient of the last queue pair */ +static VhostVDPAState *vhost_vdpa_net_last_nc_vdpa(VhostVDPAState *s) +{ + VirtIONet *n = qemu_get_nic_opaque(s->nc.peer); + NetClientState *nc = qemu_get_peer(n->nic->ncs, n->max_ncs - 1); + + return DO_UPCAST(VhostVDPAState, nc, nc); +} + static void vhost_vdpa_net_log_global_enable(VhostVDPAState *s, bool enable) { struct vhost_vdpa *v = &s->vhost_vdpa; @@ -996,6 +1005,13 @@ static int vhost_vdpa_net_load(NetClientState *nc) return r; } + for (int i = 0; i < v->dev->vq_index; ++i) { + r = vhost_vdpa_set_vring_ready(v, i); + if (unlikely(r)) { + return r; + } + } + return 0; } @@ -1255,9 +1271,35 @@ static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { .avail_handler = vhost_vdpa_net_handle_ctrl_avail, }; +/** + * Check if a vhost_vdpa device should enable before DRIVER_OK + * + * CVQ must always start first if we want to restore the state safely. Do not + * start data vqs if the device has CVQ. + */ static bool vhost_vdpa_should_enable(const struct vhost_vdpa *v) { - return true; + struct vhost_dev *dev = v->dev; + VhostVDPAState *s = container_of(v, VhostVDPAState, vhost_vdpa); + VhostVDPAState *cvq_s = vhost_vdpa_net_last_nc_vdpa(s); + + if (!(dev->vq_index_end % 2)) { + /* vDPA device does not have CVQ */ + return true; + } + + if (dev->vq_index + 1 == dev->vq_index_end) { + /* We're evaluating CVQ, that must always enable first */ + return true; + } + + if (!vhost_vdpa_net_valid_svq_features(v->dev->features, NULL) || + !cvq_s->cvq_isolated) { + /* CVQ is not isolated, so let's enable as usual */ + return true; + } + + return false; } static const VhostVDPAVirtIOOps vhost_vdpa_virtio_net_ops = {