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

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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



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