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Tsirkin" , Harpreet Singh Anand , Laurent Vivier , Shannon Nelson , Lei Yang , Dragos Tatulea Subject: [PATCH 4/7] vdpa: add stub vhost_vdpa_should_enable Date: Fri, 28 Jul 2023 19:20:25 +0200 Message-Id: <20230728172028.2074052-5-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=170.10.129.124; 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.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 will not send vring_enable until all configuration is used by the device. Add vhost-vdpa net vhost_vdpa_should_enable. Do not change the behavior in this commit, only introduce the op. Signed-off-by: Eugenio Pérez --- net/vhost-vdpa.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/net/vhost-vdpa.c b/net/vhost-vdpa.c index 9795306742..3d7dc3e5c0 100644 --- a/net/vhost-vdpa.c +++ b/net/vhost-vdpa.c @@ -1255,6 +1255,15 @@ static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { .avail_handler = vhost_vdpa_net_handle_ctrl_avail, }; +static bool vhost_vdpa_should_enable(const struct vhost_vdpa *v) +{ + return true; +} + +static const VhostVDPAVirtIOOps vhost_vdpa_virtio_net_ops = { + .should_enable = vhost_vdpa_should_enable, +}; + /** * Probe if CVQ is isolated * @@ -1378,6 +1387,7 @@ static NetClientState *net_vhost_vdpa_init(NetClientState *peer, s->vhost_vdpa.shadow_vqs_enabled = svq; s->vhost_vdpa.iova_range = iova_range; s->vhost_vdpa.shadow_data = svq; + s->vhost_vdpa.virtio_ops = &vhost_vdpa_virtio_net_ops; if (queue_pair_index == 0) { vhost_vdpa_net_valid_svq_features(features, &s->vhost_vdpa.migration_blocker);