[PATCH net-next v5 0/3] gtp: ynl spec for the GTP netlink family, a reply-command fix, and a selftest

This adds a ynl spec for the gtp genetlink family, a small driver fix
it needed, and a selftest.

Patch 1: the GET and dump replies carried the family id in the command
field, so ynl dropped them. Use GTP_CMD_GETPDP instead.
Patch 2: the spec (NEWPDP/DELPDP/GETPDP/ECHOREQ), no uapi change.
Patch 3: a selftest that adds, dumps and deletes PDP contexts.

The multicast notifications are not in the spec: they reuse the request
command values, which the ynl C generator can't express with the
current uapi header. I can look at generator support as a follow-up.

v5:
 - ynl: add CFLAGS_gtp so the generated code builds with older headers
 - spec: doc fixes (notifications, version 0, echoreq ms-address,
   ms-addr6 /64), min-len for the IPv6 attributes
 - selftest: only skip when GTP is unavailable, close the ynl handle
v4:
 - spec: request/reply attributes now match the handlers
 - selftest: fix the gtp.ko autoload crash, check ENOENT, delete by
   TEI and by MS address

v4: https://lore.kernel.org/netdev/20261010105740.223992-1-anilkaushikwireless@gmail.com/ (local)
v3: https://lore.kernel.org/netdev/20261009060615.4177402-1-anilkaushikwireless@gmail.com/ (local)
v2: https://lore.kernel.org/netdev/20261008181031.4129029-1-anilkaushikwireless@gmail.com/ (local)

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          | 183 ++++++++++++++++++
 MAINTAINERS                                   |   2 +
 drivers/net/gtp.c                             |   4 +-
 tools/net/ynl/Makefile.deps                   |   1 +
 tools/testing/selftests/net/Makefile          |   1 +
 tools/testing/selftests/net/config            |   1 +
 tools/testing/selftests/net/gtp.py            | 122 ++++++++++++
 .../testing/selftests/net/lib/py/__init__.py  |   5 +-
 tools/testing/selftests/net/lib/py/ynl.py     |   8 +-
 9 files changed, 322 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/netlink/specs/gtp.yaml
 create mode 100755 tools/testing/selftests/net/gtp.py

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2.25.1