Re: [PATCH net v7] net: sched: cls_u32: Fix u32's systematic failure to free IDR entries for hnodes.

[Victor Nogueira <victor@mojatatu.com>]

On 10/11/2024 14:28, Alexandre Ferrieux wrote:
> To generate hnode handles (in gen_new_htid()), u32 uses IDR and
> encodes the returned small integer into a structured 32-bit
> word. Unfortunately, at disposal time, the needed decoding
> is not done. As a result, idr_remove() fails, and the IDR
> fills up. Since its size is 2048, the following script ends up
> with "Filter already exists":
> 
>    tc filter add dev myve $FILTER1
>    tc filter add dev myve $FILTER2
>    for i in {1..2048}
>    do
>      echo $i
>      tc filter del dev myve $FILTER2
>      tc filter add dev myve $FILTER2
>    done
> 
> This patch adds the missing decoding logic for handles that
> deserve it.
> 
> Fixes: e7614370d6f0 ("net_sched: use idr to allocate u32 filter handles")
> Reviewed-by: Eric Dumazet <edumazet@google.com>
> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
> Signed-off-by: Alexandre Ferrieux <alexandre.ferrieux@orange.com>

Tested-by: Victor Nogueira <victor@mojatatu.com>