TDA4VH-Q1: How to set the pvid of logical port and physical port?

sun ruijie

Part Number: TDA4VH-Q1
Other Parts Discussed in Thread: TDA4VH

Tool/software:

Hi TIs,

We are using tda4vh SDK0900 linux native driver to test the vlan setting. The network topology is as follows:

The physical interface corresponding to eth1 is phy1. We add the physical interface eth1 to the logical interface br1 with the following command. The pvid of logical interface br1 is 11, while the pvid of logical interface eth1 is 20.

./devlink dev param set platform/c000000.ethernet name switch_mode value true cmode runtime

ip link add name br1 type bridge
ip link set dev eth1 up
ip link set dev eth1 master br1


bridge vlan add dev eth1 vid 20 pvid 20
bridge vlan add dev eth1 vid 5

bridge vlan add dev br1 vid 11 pvid self
ifconfig br1 up

If we send a packet without vlan tag through tda4vh_2, then this packet is tagged with vlan tag 20 according to eth1's pvid 20 of tda4vh_1. However, we found out through tcpdump that the vlan id of this packet is 11, which is also the pvid of br1. why does this packet have a vlan tag 20 according to eth1's pvid of tda4vh_1? Why is the vlan tag of this packet the pvid of br1?

Best Regards,
Ruijie

5 months ago

0 Tanmay Patil 5 months ago

TI__Mastermind 30430 points

Hi Ruijie,

PVID means port - VID. It is the VLAN ID which a port adds by default to the incoming packets. There can be only one such PVID per port. You first set the PVID to 20 for eth1. But then you set the PVID for br1 to 11. Whenever you set pvid for a bridge interface, all the interfaces connected to it get their PVID changed to bridge's pvid. Hence the final pvid will become 11.

Regards,
Tanmay

0 sun ruijie 5 months ago in reply to Tanmay Patil

Intellectual 583 points

Hi Tanmay,

thanks for your replay.

We found that if we switch tda4vh to switch mode by the following command, the packets sent through raw_socket are with vlan tag. But the packets sent by the same raw_socket on other boards (such as imx) do not have vlan tag. All packets sent by tda4vh in switch mode have vlan tag? Is there a way to make tda4vh send out packets without vlan tag?

Best Regards,
Ruijie

0 Tanmay Patil 5 months ago in reply to sun ruijie

TI__Mastermind 30430 points

Hi Ruijie,

Can you write out the command you use in order. And the things you are testing.

I can try to replicate this on my end.

Regards,
Tanmay

0 sun ruijie 5 months ago in reply to Tanmay Patil

Intellectual 583 points

Hi Tanmay,

we are using the TDA4VH 0900 linux native driver.

In tda4vh_1, it's in mac mode in order to check the content of packets.

ifconfig eth1 up

tcpdump -i eth1 -xx

In tda4vh_2, it's in switch mode. We used the tool plget(GitHub - ikhorn/plget: plget is a tool used to measure latency packets spent in network stack, NIC driver and on the wire, trace interpacket gap, based as on h/w as on sw timestamping, as for rx as for tx path, measure speed and more ...) to send packets.

./devlink dev param set platform/c000000.ethernet name switch_mode value true cmode runtime

ifconfig eth1 up

./plget -i eth1 -t ptp12 -m tx-lat -n 10 -l 512 -a 3a:e1:9e:ec:39:45

Then the result of tda4vh_1:

If we set add the eth1 into the bridge br0 and set the untagged in the eth1, the vlan tag still exists.

ip link add name br0 type bridge 

ip link set dev br0 up
ip link set dev eth1 master br0

ip link set dev br0 type bridge vlan_filtering 1

bridge vlan del dev br0 vid 1 self
bridge vlan del dev eth1 vid 1

bridge vlan add dev eth1 vid 1 untagged 

./plget -i eth1 -t ptp12 -m tx-lat -n 10 -l 512 -a 3a:e1:9e:ec:39:45

The vlan tag is changed to 0 in the tda4vh_1.

About the above test, we have two questions.
1. why the packet sent through raw_socket has a vlan tag, and the vlan tag is 1. Even if I change the pvid of eth1, the vlan tag of this packet is still 1.
2. why the vlan tag still exists on the received packet after setting untagged on eth1, it is not possible to have the vlan tag field in the header.

Best Regards,
Ruijie

0 Tanmay Patil 4 months ago in reply to sun ruijie

TI__Mastermind 30430 points

Hi Ruijie,

Give me a couple of days to try this out on my end.

Regards,
Tanmay

0 sun ruijie 4 months ago in reply to Tanmay Patil

Intellectual 583 points

Hi Tanmay,

Any new developments, please?

Best Regards,
Ruijie

0 Brijesh Jadav 1 month ago in reply to sun ruijie

TI__Guru**** 430035 points

Unlocking this thread.

0 Semon Zhang 23 days ago in reply to sun ruijie

TI__Expert 5681 points

sun ruijie said:
Any new developments, please?

Hello Ruijie

is this issue existed yet?

Regards

Semon

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TDA4VH-Q1: How to set the pvid of logical port and physical port?