This respins the RFC "netlink: specs: add genetlink-legacy spec for GTP" (netdev, 2026-10-01) as a patch, and adds a driver fix the spec exposed plus a selftest that uses it.
While writing a ynl-based selftest for the existing gtp family I found that the GET and dump replies put the genl family id in the command field instead of a GTP_CMD_* value. libgtpnl ignores the command so it never mattered, but ynl rejects the reply as an unknown command and drops it. Patch 1 fixes the driver; patches 2 and 3 then describe and test the family. Patch 1 sets a valid command (GTP_CMD_GETPDP) in the get and dump replies. Patch 2 adds a genetlink-legacy ynl spec for the gtp family (NEWPDP/DELPDP/GETPDP/ECHOREQ). Description only, no uapi change. Patch 3 adds a selftest built on the spec: it creates a gtp device, adds a PDP context with newpdp, checks getpdp lists it and delpdp removes it. It skips when the kernel or iproute2 lack GTP support. Changes since v2: - selftest: add CONFIG_GTP to tools/testing/selftests/net/config (kept in sorted order). - selftest: move gtp.py to its correct alphabetical slot in the net Makefile (after the gre_* entries) and mark the script executable. - selftest: add docstrings to the three test functions and main(); ruff check is clean under tools/testing/selftests/net/ruff.toml. - selftest: move GtpFamily before PSPFamily in lib/py (import and __all__). - Patches 1 and 2 are unchanged from v2. v2: https://lore.kernel.org/netdev/[email protected]/ Anil Kaushik (3): gtp: set a valid genl command in PDP context get and dump replies netlink: specs: add genetlink-legacy spec for GTP selftests: net: add a test for the gtp netlink family Documentation/netlink/specs/gtp.yaml | 170 ++++++++++++++++++ MAINTAINERS | 2 + drivers/net/gtp.c | 4 +- tools/testing/selftests/net/Makefile | 1 + tools/testing/selftests/net/config | 1 + tools/testing/selftests/net/gtp.py | 85 +++++++++ .../testing/selftests/net/lib/py/__init__.py | 5 +- tools/testing/selftests/net/lib/py/ynl.py | 8 +- 8 files changed, 271 insertions(+), 5 deletions(-) create mode 100644 Documentation/netlink/specs/gtp.yaml create mode 100755 tools/testing/selftests/net/gtp.py -- 2.25.1
