[ovs-dev] Query regarding active flows in kernel space

[Ben Pfaff]

On Mon, Oct 15, 2012 at 09:08:29PM +0530, ankur dwivedi wrote:
> As expected active flows in the kernel space should not get deleted from
> kernel space flow table, but how does kernel space notifies user space not
> to delete the active flows?
> 
>  I browsed the code but unable to find any messages transferred between
> kernel space and user space for the above scenario through the netlink
> sockets used.

Userspace uses an OVS_FLOW_CMD_DUMP command to obtain flow statistics
periodically.  Based on the results, userspace decides which flows to
delete.