netdev - Re: DSA with MV88E6321 and imx28

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Message-ID: <635c884a-185d-5b3b-7f91-ce058d9726f4@eks-engel.de>
Date:   Tue, 11 Jun 2019 09:36:16 +0200
From:   Benjamin Beckmeyer <beb@...-engel.de>
To:     Andrew Lunn <andrew@...n.ch>
CC:     <netdev@...r.kernel.org>
Subject: Re: DSA with MV88E6321 and imx28

>> So all ports are now in forwarding mode (Switch port register 0x4 of all ports 
>> are 0x7f), but I don't reach it over ping.
> Hi
>
> The most common error for people new to DSA is forgetting to bring
> the master interface up.
>
> The second thing to understand is that by default, all interfaces are
> separated. So the switch won't bridge frames between ports, until you
> add the ports to a Linux bridge. But you can give each interface its
> own IP address.
>
>     Andrew

Hi Andrew,
thanks for your help again. Sorry for the late reply we had a stats day yesterday. 
What interface do you mean with master interface? I assume, you mean eth0 (cpu port)?
I deleted the IP address of this interface and tried to add it to the bridge:

brctl addif bridge0 eth0
brctl: bridge bridge0: Invalid argument

I tried this with all lan1-4 interfaces and they just work and directly after
I added them I got some information about the port:

brctl addif br0 lan4
[  156.085842] br0: port 4(lan4) entered blocking state
[  156.091022] br0: port 4(lan4) entered disabled state

After I brought up the bridge with:

ip link set br0 up
[  445.313697] br0: port 4(lan4) entered blocking state
[  445.318896] br0: port 4(lan4) entered forwarding state

So I gave my eth0 an IP address and started tcpdump on eth0:

tcpdump -i eth0
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
01:11:36.040006 ARP, Request who-has 192.168.10.1 tell 192.168.10.2, length 46
01:11:37.062283 ARP, Request who-has 192.168.10.1 tell 192.168.10.2, length 46
01:11:38.086465 ARP, Request who-has 192.168.10.1 tell 192.168.10.2, length 46

How you can see, I get the ARP request but no reply from my device. No ping is
working. All interfaces are up:

ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,ALLMULTI,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff
    inet 192.168.10.201/24 brd 192.168.10.255 scope global eth0
       valid_lft forever preferred_lft forever
3: Serdes0@...0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop switchid 00000000 state DOWN group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff
4: Serdes1@...0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop switchid 00000000 state DOWN group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff
5: lan1@...0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br0 switchid 00000000 state UP group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff
6: lan2@...0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 switchid 00000000 state LOWERLAYERDOWN group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff
7: lan3@...0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 switchid 00000000 state LOWERLAYERDOWN group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff
8: lan4@...0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue master br0 switchid 00000000 state LOWERLAYERDOWN group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff
9: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 6a:d0:d5:9c:fe:f3 brd ff:ff:ff:ff:ff:ff

Am I doing something wrong or maybe I forget something?

Cheers,
Benjamin