Add fixtures to call dpus on smartswtich directly

[JibinBao]

Description of PR

The mgmt IP of dpus on smartswitch is private IP(169.254.200.0/24), we cannot access it directly out of the switch. To operate dpu like operating switch when impmenting the test case(dash, platform on dup), we add two fixtures: dpuhost and fixture_dpuhosts. They are same as duthost and fixture_duthosts.
Before the calling the fixtures, we need to do the steps as follows:

1. Enable the NAT configuation on SmartSwitch by running sonic-dpu-mgmt-traffic.sh
   [SmartSwitch] Added inbound traffic capability for DPU management traffic script sonic-net/sonic-buildimage#20635
   e.g.

sonic-dpu-mgmt-traffic.sh inbound -e --dpus all --ports 5021,5022,5023,5024

2. Add dpu information to ansible/inventory(Notes: the ansible_ssh_port should be same as the above config of NAT)
   e.g.

smartswtich-01 ansible_host=10.200.100.2 sonic_version=v2 sonic_hwsku=Mellanox-SN4280-O28 switch_type="switch"....
smartswtich-01-dpu-0 ansible_host=10.200.100.2 ansible_ssh_port=5021 sonic_version=v2 sonic_hwsku=Nvidia-bf3-
com-dpu switch_type="dpu" ....
smartswtich-01-dpu-1 ansible_host=10.200.100.2 ansible_ssh_port=5022 sonic_version=v2 sonic_hwsku=Nvidia-bf3-
com-dpu switch_type="dpu" ....
smartswtich-01-dpu-2 ansible_host=10.200.100.2 ansible_ssh_port=5023 sonic_version=v2 sonic_hwsku=Nvidia-bf3-
com-dpu switch_type="dpu" ....
smartswtich-01-dpu-3 ansible_host=10.200.100.2 ansible_ssh_port=5024 sonic_version=v2 sonic_hwsku=Nvidia-bf3-
com-dpu switch_type="dpu" ....

3. Add dpu information to ansible/testbed.yaml
   e.g.

• conf-name: smartswtich-01-t1-28-lag
  group-name: vm-t2
  topo: t1-28-lag
  ptf_image_name: docker-ptf-mlnx
  ptf: ptf-smartswtich-01
  ptf_ip: 10.200.100.12/24
  ptf_ipv6:
  server: server_72
  vm_base: VM3701
  dut:
  • smartswtich-01
  • smartswtich-01-dpu-0
  • smartswtich-01-dpu-1
  • smartswtich-01-dpu-2
  • smartswtich-01-dpu-3
    comment: smartswitch testbed

4. Add dpu infromation to ansible/lab

smartswtich-01-dpu-0 ansible_host=10.200.100.2 ansible_ssh_port=5021 ansible_hostv6="fe80::966d:aeff:fe04:1f58" sonic_version=v2 hwsku="Nvidia-bf3-com-dpu" iface_speed=100000 mgmt_subnet_mask_length=22 vm_base=VM0000
smartswtich-01-dpu-1 ansible_host=10.200.100.2 ansible_ssh_port=5022 ansible_hostv6="fe80::966d:aeff:fe04:1f58" sonic_version=v2 hwsku="Nvidia-bf3-com-dpu" iface_speed=100000 mgmt_subnet_mask_length=22 vm_base=VM0000
smartswtich-01-dpu-2 ansible_host=10.200.100.2 ansible_ssh_port=5023 ansible_hostv6="fe80::966d:aeff:fe04:1f58" sonic_version=v2 hwsku="Nvidia-bf3-com-dpu" iface_speed=100000 mgmt_subnet_mask_length=22 vm_base=VM0000
smartswtich-01-dpu-3 ansible_host=10.200.100.2 ansible_ssh_port=5024 ansible_hostv6="fe80::966d:aeff:fe04:1f58" sonic_version=v2 hwsku="Nvidia-bf3-com-dpu" iface_speed=100000 mgmt_subnet_mask_length=22 vm_base=VM0000

So, we can access the dpu directly out of switch such as "ssh admin@10.200.100.2 -p 5021"

Run tests usage:
When runing case only on dpu（For the exsiting tests such as platform, techsupport, we can run them without any case change）:

python3 -m pytest platform_tests/cli/test_show_platform.py --testbed smartswitch-01-t1-28-lag --host-pattern smartswitch-01-dpu-0 ....

When running case on smartswitch(NPU) and dpu:

python3 -m pytest dash/test_dash_privatelink.py --testbed smartswitch-01-t1-28-lag --host-pattern smartswitch-01 --dpu-pattern smartswitch-01-dpu-0,smartswitch-01-dpu-1,smartswitch-01-dpu-2,smartswitch-01-dpu-3 .....

Summary:
Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Back port request

• 202012
• 202205
• 202305
• 202311
• 202405

Approach

What is the motivation for this PR?

Add fixtures to operate dup directly out of switch like operating switch

How did you do it?

Add fixures : duthost and fixture_duthosts

How did you verify/test it?

run platform case on dpu only and dash case on smartswitch

Any platform specific information?

SmartSwtich

Supported testbed topology if it's a new test case?

Documentation