Subject: Re: [Patch net-next] net_sched: destroy proto tp when all filters are gone

From: Jamal Hadi Salim <[email-masked]>
Date: Mon, 09 Mar 2015 09:43:26 -0400

On 03/06/15 14:47, Cong Wang wrote:
> From: Cong Wang<[email-masked]>
>
> Kernel automatically creates a tp for each
> (kind, protocol, priority) tuple, which has handle 0,
> when we add a new filter, but it still is left there
> after we remove our own, unless we don't specify the
> handle (literally means all the filters under
> the tuple). For example this one is left:
>
>    # tc filter show dev eth0
>    filter parent 8001: protocol arp pref 49152 basic
>
> The user-space is hard to clean up these for kernel
> because filters like u32 are organized in a complex way.
> So kernel is responsible to remove it after all filters
> are gone.  Each type of filter has its own way to
> store the filters, so each type has to provide its
> way to check if all filters are gone.
>
> Cc: Jamal Hadi Salim<[email-masked]>
> Signed-off-by: Cong Wang<[email-masked]>
> Signed-off-by: Cong Wang<[email-masked]>

Acked-by: Jamal Hadi Salim<[email-masked]>

cheers,
jamal