From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jason Wang Subject: [RFC v3 PATCH 0/4] Send gratuitous packets by guest Date: Thu, 27 Oct 2011 16:48:26 +0800 Message-ID: <20111027084700.15020.24087.stgit@dhcp-8-146.nay.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, kvm@vger.kernel.org To: aliguori@us.ibm.com, mst@redhat.com, jan.kiszka@siemens.com, rusty@rustcorp.com.au, qemu-devel@nongnu.org, blauwirbel@gmail.com, stefanha@gmail.com Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org Sender: qemu-devel-bounces+gceq-qemu-devel=gmane.org@nongnu.org List-Id: netdev.vger.kernel.org We only track primary mac address in qemu and send rarp packets after migration to notify the switch to update its mac address table. This may not works when guest have complicated network configurations such as tagged vlan or ipv6, those connections may be lost or stalled after migration. One method to handle them is snooping the network traffic in qemu and recording use of mac, but this method would hurt performance and is impossible for network backend such as vhost. So the best method to address it is to let guest instead of qemu to send gratuitous packet. This series first add a model specific fucntion which can let nic model to implement its own announce method and then implement a virtio-net specific function to let guest send the gratitous packet. Changes from v2: - Conditionally send the notification interrupt to guest (only for migration, cont, loadvm). - Remove the unused patch of function export. - Typos and other comments from Stefan Hajnoczi. - Disable guest announce for compat machine types. --- Jason Wang (4): announce self after vm start net: model specific announcing support virtio-net: notify guest to annouce itself virtio-net: compat guest announce support. gdbstub.c | 2 +- hw/pc_piix.c | 16 ++++++++++++++++ hw/virtio-net.c | 18 +++++++++++++++++- hw/virtio-net.h | 3 +++ migration.c | 4 ++-- monitor.c | 4 ++-- net.h | 2 ++ savevm.c | 10 ++++++---- sysemu.h | 2 +- vl.c | 7 +++++-- 10 files changed, 55 insertions(+), 13 deletions(-) -- Jason Wang