Re: [PATCH net-next v5 3/5] net: bridge: Add netlink knobs for number / max learned FDB entries

[Ido Schimmel]

On Mon, Oct 16, 2023 at 03:27:22PM +0200, Johannes Nixdorf wrote:
> The previous patch added accounting and a limit for the number of
> dynamically learned FDB entries per bridge. However it did not provide
> means to actually configure those bounds or read back the count. This
> patch does that.
> 
> Two new netlink attributes are added for the accounting and limit of
> dynamically learned FDB entries:
>  - IFLA_BR_FDB_N_LEARNED (RO) for the number of entries accounted for
>    a single bridge.
>  - IFLA_BR_FDB_MAX_LEARNED (RW) for the configured limit of entries for
>    the bridge.
> 
> The new attributes are used like this:
> 
>  # ip link add name br up type bridge fdb_max_learned 256
>  # ip link add name v1 up master br type veth peer v2
>  # ip link set up dev v2
>  # mausezahn -a rand -c 1024 v2
>  0.01 seconds (90877 packets per second
>  # bridge fdb | grep -v permanent | wc -l
>  256
>  # ip -d link show dev br
>  13: br: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 [...]
>      [...] fdb_n_learned 256 fdb_max_learned 256
> 
> Signed-off-by: Johannes Nixdorf <jnixdorf-oss@xxxxxx>

Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxx>