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Grygorii Strashko says:
====================
net: ethernet: ti: enable bc/mc storm prevention support
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/mask:
- ff:ff:ff:ff:ff:ff/ff:ff:ff:ff:ff:ff has to be used for BC packets rate
limiting (exact match)
- 01:00:00:00:00:00/01:00:00:00:00:00 fixed value has to be used for MC
packets rate limiting
The CPSW supports MC/BC packets rate limiting in packets/sec and affects
all ingress MC/BC packets and serves as BC/MC storm prevention feature.
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 drop
- MC rate limit to 20000pps:
tc qdisc add dev eth0 clsact
tc filter add dev eth0 ingress flower skip_sw dst_mac 01:00:00:00:00:00/01:00:00:00:00:00 \
action police rate pkts_rate 20000 pkts_burst 1 drop
pkts_burst - not used.
The solution inspired patch from Vladimir Oltean [1].
Changes in v3:
- comments applied
- policer validation added
Changes in v2:
- switch to packet-per-second policing introduced by
commit 2ffe039528 ("net/sched: act_police: add support for packet-per-second policing") [2]
v2: https://patchwork.kernel.org/project/netdevbpf/cover/20211101170122.19160-1-grygorii.strashko@ti.com/
v1: https://patchwork.kernel.org/project/netdevbpf/cover/20201114035654.32658-1-grygorii.strashko@ti.com/
[1] https://lore.kernel.org/patchwork/patch/1217254/
[2] https://patchwork.kernel.org/project/netdevbpf/cover/20210312140831.23346-1-simon.horman@netronome.com/
====================
Signed-off-by: David S. Miller <davem@davemloft.net>
Linux kernel
============
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