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

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Date:   Tue, 2 Nov 2021 14:38:15 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Grygorii Strashko <grygorii.strashko@...com>
CC:     "David S. Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
        Tony Lindgren <tony@...mide.com>, Andrew Lunn <andrew@...n.ch>
Subject: Re: [PATCH net-next v2 0/3] net: ethernet: ti: cpsw: enable bc/mc
 storm prevention support

On Tue, Nov 02, 2021 at 02:36:54PM +0200, Grygorii Strashko wrote:
> 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@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/
> > > 
> > > 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.

Ok, good.