Merge branch 'selftests-classid'

Pedro Tammela says:

====================
selftests/tc-testing: add tests covering classid

Patches 1-3 add missing tests covering classid behaviour on tdc for cls_fw,
cls_route and cls_fw. This behaviour was recently fixed by valis[0].

Patch 4 comes from the development done in the previous patches as it turns out
cls_route never returns meaningful errors.

[0] https://lore.kernel.org/all/20230729123202.72406-1-jhs@mojatatu.com/

v2->v3: https://lore.kernel.org/all/20230825155148.659895-1-pctammela@mojatatu.com/
   - Added changes that were left in the working tree (Jakub)
   - Fixed two typos in commit message titles
   - Added Victor tags

v1->v2: https://lore.kernel.org/all/20230818163544.351104-1-pctammela@mojatatu.com/
   - Drop u32 updates
====================

Signed-off-by: David S. Miller <davem@davemloft.net>