Add vxlan hw tc offload

[jtluka]

Description

This pull request adds new tests SRIOVNetns[Vxlan|Geneve]TcRecipe. To avoid code duplication I moved most of the functionality to
a new base class BaseSRIOVNetnsTcRecipe and updated the existing SRIOVNetnsTcRecipe to use the base class.

The new base class provides two common methods that the derived class overrides:

• add_tc_filter_rules() (must be defined by every derived class)
• add_network_layers() (optional, to define additional network stacks, for example tunnels between VFs)

Tests

J:8496033
J:8496862 (with geneve)
J:8508546

Reviews

@Axonis @olichtne

[olichtne]

mostly ok, but i'd like to now keep consistency with avoiding to use the ip_filters method for using followup configuration commands. this can lead to non-deterministic behaviour in case of issues with configuration.

other than this i'll also check the test runs but i assume if everything is working that this should be ok.

[olichtne]

one more question the test you link to J:8496862 (with geneve) has 3mlx5_core_25g tests, 3mlx5_cx6dx tests but only 1*ice test, is this intentional?

[jtluka]

one more question the test you link to J:8496862 (with geneve) has 3_mlx5_core_25g tests, 3_mlx5_cx6dx tests but only 1*ice test, is this intentional?

yes, ice does not have hw offload for encap/decapsulation, so I do not plan to add these in the test set.