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

[Nikolay Aleksandrov]

On 10/16/23 16:27, 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>
> ---
>   include/uapi/linux/if_link.h |  2 ++
>   net/bridge/br_netlink.c      | 15 ++++++++++++++-
>   2 files changed, 16 insertions(+), 1 deletion(-)

Acked-by: Nikolay Aleksandrov <razor@xxxxxxxxxxxxx>