Re: [PATCH net-next v2 0/3] net: ethernet: ti: cpsw: enable bc/mc storm prevention support

[Grygorii Strashko]

On 02/11/2021 01:53, Vladimir Oltean wrote:
> On Mon, Nov 01, 2021 at 07:01:19PM +0200, Grygorii Strashko wrote:
> > Hi
> >
> > This series first adds supports for the ALE feature to rate limit number ingress
> > broadcast(BC)/multicast(MC) packets per/sec which main purpose is BC/MC storm
> > prevention.
> >
> > And then enables corresponding support for ingress broadcast(BC)/multicast(MC)
> > packets rate limiting for TI CPSW switchdev and AM65x/J221E CPSW_NUSS drivers by
> > implementing HW offload for simple tc-flower with policer action with matches
> > on dst_mac:
> >   - ff:ff:ff:ff:ff:ff has to be used for BC packets rate limiting
> >   - 01:00:00:00:00:00 fixed value has to be used for MC packets rate limiting
> >
> > Examples:
> > - BC rate limit to 1000pps:
> >    tc qdisc add dev eth0 clsact
> >    tc filter add dev eth0 ingress flower skip_sw dst_mac ff:ff:ff:ff:ff:ff \
> >    action police pkts_rate 1000 pkts_burst 1
> >
> > - MC rate limit to 20000pps:
> >    tc qdisc add dev eth0 clsact
> >    tc filter add dev eth0 ingress flower skip_sw dst_mac 01:00:00:00:00:00 \
> >    action police pkts_rate 10000 pkts_burst 1
> >
> >    pkts_burst - not used.
> >
> > The solution inspired patch from Vladimir Oltean [1].
> >
> > Changes in v2:
> >   - switch to packet-per-second policing introduced by
> >     commit 2ffe0395288a ("net/sched: act_police: add support for packet-per-second policing") [2]
> >
> > v1: https://patchwork.kernel.org/project/netdevbpf/cover/20201114035654.32658-1-grygorii.strashko@xxxxxx/
> >
> > [1] https://lore.kernel.org/patchwork/patch/1217254/
> > [2] https://patchwork.kernel.org/project/netdevbpf/cover/20210312140831.23346-1-simon.horman@xxxxxxxxxxxxx/
> >
> > Grygorii Strashko (3):
> >    drivers: net: cpsw: ale: add broadcast/multicast rate limit support
> >    net: ethernet: ti: am65-cpsw: enable bc/mc storm prevention support
> >    net: ethernet: ti: cpsw_new: enable bc/mc storm prevention support
> >
> >   drivers/net/ethernet/ti/am65-cpsw-qos.c | 145 ++++++++++++++++++++
> >   drivers/net/ethernet/ti/am65-cpsw-qos.h |   8 ++
> >   drivers/net/ethernet/ti/cpsw_ale.c      |  66 +++++++++
> >   drivers/net/ethernet/ti/cpsw_ale.h      |   2 +
> >   drivers/net/ethernet/ti/cpsw_new.c      |   4 +-
> >   drivers/net/ethernet/ti/cpsw_priv.c     | 170 ++++++++++++++++++++++++
> >   drivers/net/ethernet/ti/cpsw_priv.h     |   8 ++
> >   7 files changed, 402 insertions(+), 1 deletion(-)
> >
> > --
> > 2.17.1
>
> I don't think I've asked this for v1, but when you say multicast storm
> control, does the hardware police just unknown multicast frames, or all
> multicast frames?

 packets per/sec rate limiting is affects all MC or BC packets once enabled.

--
Best regards,
grygorii