Date:   Mon, 31 Oct 2022 16:51:47 +0100
From:   Steen Hegelund <steen.hegelund@...rochip.com>
To:     Casper Andersson <casper.casan@...il.com>
CC:     "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        <UNGLinuxDriver@...rochip.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Russell King <rmk+kernel@...linux.org.uk>,
        "Wan Jiabing" <wanjiabing@...o.com>,
        Nathan Huckleberry <nhuck@...gle.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Daniel Machon <daniel.machon@...rochip.com>,
        Horatiu Vultur <horatiu.vultur@...rochip.com>,
        Lars Povlsen <lars.povlsen@...rochip.com>
Subject: Re: [PATCH net-next v2 2/5] net: microchip: sparx5: Adding more tc
 flower keys for the IS2 VCAP

Hi Casper,

On Mon, 2022-10-31 at 15:52 +0100, Casper Andersson wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> Hi Steen,
> 
> On 2022-10-31 13:14, Steen Hegelund wrote:
> > Hi Casper,
> > 
> > First of all thanks for the testing effort (as usual).  This is most welcome.
> > 
> > On Mon, 2022-10-31 at 11:44 +0100, Casper Andersson wrote:
> > > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > > 
> > > Hi Steen,
> > > 
> > > On 2022-10-28 16:45, Steen Hegelund wrote:
> > > > - IPv4 Addresses
> > > >     tc filter add dev eth12 ingress chain 8000000 prio 12 handle 12 \
> > > >         protocol ip flower skip_sw dst_ip 1.0.1.1 src_ip 2.0.2.2    \
> > > >         action trap
> > > 
> > > I'm not able to get this working on PCB135. I tested the VLAN tags and
> > > did not work either (did not test the rest). The example from the
> > > previous patch series doesn't work either after applying this series.
> > 
> > 
> > Yes I did not really explain this part (and I will update the series with an explanation).
> > 
> > 1) The rule example in the previous series will no longer work as expected as the changes to the
> > port keyset configuration now requires a non-ip frame to generate the MAC_ETYPE keyset.
> > 
> > So to test the MAC_ETYPE case your rule must be non-ip and not use "protocol all" which is not
> > supported yet.
> > 
> > Here is an example using the "protocol 0xbeef":
> > 
> > tc qdisc add dev eth3 clsact
> > tc filter add dev eth3 ingress chain 8000000 prio 10 handle 10 \
> >         protocol 0xbeef flower skip_sw \
> >         dst_mac 0a:0b:0c:0d:0e:0f \
> >         src_mac 2:0:0:0:0:1 \
> >         action trap
> > 
> > And send a frame like this (using EasyFrame):
> > 
> > ef tx eth_fiber1 rep 10 eth dmac 0a:0b:0c:0d:0e:0f smac 2::1 et 0xbeef data repeat 50 0x61
> 
> Thanks, this works. I saw now that you even mentioned that "protocol
> all" doesn't work at the very end of this commit message.
> 
> > I am not sure what went wrong when you tested the ipv4 rule, but if I create the rule that you
> > quoted above the rule is activated when I send frames like this:
> > 
> > ef tx eth_fiber1 rep 10 eth dmac 0a:0b:0c:0d:0e:0f smac 2::2 ipv4 dip 1.0.1.1 sip 2.0.2.2  data
> > repeat 50 0x61
> 
> Looks like adding the "data" at the end of it makes a difference when
> creating the packets. Without it the ip.proto field becomes 17 (UDP).
> With "data" it becomes 0 (IPv6 Hop-by-Hop Option). Ef will defaults to
> 17 if no data is specified, otherwise it ends up 0. And the reason
> UDP doesn't get trapped I assume is because this rule falls under the
> IPV4_OTHER keyset (as opposed to IPV4_TCP_UDP).

Yes the EasyFrame tool just uses defaults if you do not specify any data for the frame, so I usually
try to remember to do that to tweak the test a bit.

> 
> Doing just this was enough:
> ef tx eth0 rep 10 eth dmac 0a:0b:0c:0d:0e:0f smac 2::2 ipv4 dip 1.0.1.1 sip 2.0.2.2 data
> 
> This also solved it for VLANs. I have successfully tested ipv4, ipv6,
> protocol info (ICMP), and vlan tag info from the examples you provided.
> 
> Tested on Microchip PCB135 switch.
> 
> Tested-by: Casper Andersson <casper.casan@...il.com>
> 
> BR,
> Casper
> 
> > 
> > Note that the smac is changed to avoid hitting the first rule.
> > 
> > 2) As for the VLAN based rules, the VLAN information used by IS2 is the classified VID and PCP,
> > so
> > you need to create a bridge and add the VID to the bridge and the ports to see this in action.
> > 
> > IS0 uses the VLAN tags in the frames directly: this is one of the differences between IS0 and
> > IS2.
> > 
> > This is how I set up a bridge on my PCB134 when I do the testing:
> > 
> > ip link add name br5 type bridge
> > ip link set dev br5 up
> > ip link set eth12 master br5
> > ip link set eth13 master br5
> > ip link set eth14 master br5
> > ip link set eth15 master br5
> > sysctl -w net.ipv6.conf.eth12.disable_ipv6=1
> > sysctl -w net.ipv6.conf.eth13.disable_ipv6=1
> > sysctl -w net.ipv6.conf.eth14.disable_ipv6=1
> > sysctl -w net.ipv6.conf.eth15.disable_ipv6=1
> > sysctl -w net.ipv6.conf.br5.disable_ipv6=1
> > ip link set dev br5 type bridge vlan_filtering 1
> > bridge vlan add dev eth12 vid 600
> > bridge vlan add dev eth13 vid 600
> > bridge vlan add dev eth14 vid 600
> > bridge vlan add dev eth15 vid 600
> > bridge vlan add dev br5 vid 600 self
> > 
> > This should now allow you to use the classified VLAN information in IS2 on these four ports.
> > 
> > > 
> > > This example was provided in your last patch series and worked earlier.
> > > 
> > > My setup is PC-eth0 -> PCB135-eth3 and I use the following EasyFrames
> > > command to send packets:
> > > 
> > > ef tx eth0 rep 50 eth smac 02:00:00:00:00:01 dmac 0a:0b:0c:0d:0e:0f
> > > 
> > > IPv4:
> > > tc qdisc add dev eth3 clsact
> > > tc filter add dev eth3 ingress chain 8000000 prio 12 handle 12 \
> > >     protocol ip flower skip_sw dst_ip 1.0.1.1 src_ip 2.0.2.2    \
> > >     action trap
> > > 
> > > ef tx eth0 rep 50 eth smac 02:00:00:00:00:01 dmac 0a:0b:0c:0d:0e:0f ipv4 dip 1.0.1.1 sip
> > > 2.0.2.2
> > > 
> > > Same setup as above and I can't get this to work either.
> > 
> > Maybe you are hitting the first rule here, so changing the smac to avoid that, should help.
> > 
> > > 
> > > I'm using tcpdump to watch the interface to see if the packets are being
> > > trapped or not. Changing the packets' dmac to broadcast lets me see the
> > > packets so I don't have any issue with the setup.
> > > 
> > > BR,
> > > Casper
> > > 
> > 
> > Best Regards
> > Steen
> 
> BR,
> Casper

Thanks again for the testing.  I will send an updated series with a bit more explanation in the
commit header.

BR
Steen

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