Re: [PATCH v6 3/3] net: dsa: ocelot: Add support for QinQ Operation

Hi Hongbo,

On Wed, Sep 16, 2020 at 05:48:45PM +0800, hongbo.wang@nxp.com wrote:

From: "hongbo.wang" <redacted>

This feature can be test in the following case:
Customer <-----> swp0  <-----> swp1 <-----> ISP

Customer will send and receive packets with single VLAN tag(CTAG),
ISP will send and receive packets with double VLAN tag(STAG and CTAG).
This refers to "4.3.3 Provider Bridges and Q-in-Q Operation" in
VSC99599_1_00_TS.pdf.

The related test commands:
1.
devlink dev param set pci/0000:00:00.5 name qinq_port_bitmap \
value 2 cmode runtime
2.
ip link add dev br0 type bridge vlan_protocol 802.1ad
ip link set dev swp0 master br0
ip link set dev swp1 master br0
ip link set dev br0 type bridge vlan_filtering 1
3.
bridge vlan del dev swp0 vid 1 pvid
bridge vlan add dev swp0 vid 100 pvid untagged
bridge vlan add dev swp1 vid 100
Result:
Customer(tpid:8100 vid:111) -> swp0 -> swp1 -> ISP(STAG \
            tpid:88A8 vid:100, CTAG tpid:8100 vid:111)
ISP(tpid:88A8 vid:100 tpid:8100 vid:222) -> swp1 -> swp0 ->\
            Customer(tpid:8100 vid:222)

Signed-off-by: hongbo.wang <redacted>
---

Can you please explain what is the purpose of the devlink parameter
command? As far as I understand, the commands from step 2 and 3 should
behave like that, even without running the command at step 1.

Thanks,
-Vladimir