[PATCH net-next v7 0/4] gtp: ynl spec for the GTP netlink family, two fixes, and a selftest

[Anil Kaushik <anilkaushikwireless@gmail.com>]

This adds a ynl spec for the gtp genetlink family, two small driver
fixes, 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: new in v7. On the netdev CI debug kernel, the selftest hit an
RCU warning: adding a PDP context looks up the device without the RCU
read lock. Hold it around the lookup.
Patch 3: the spec (NEWPDP/DELPDP/GETPDP/ECHOREQ), no uapi change.
Patch 4: 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.

v7:
 - new patch 2: fix the RCU warning the selftest found on debug kernels
 - selftest: add a docstring to GtpFamily (pylint)
 - Cc Stanislav for lib/py
v6:
 - spec: use the gtp_version uapi enum for the version attribute
 - spec: family only applies to the MS address, fix its doc
 - selftest: also skip on "Unknown device type", printed by iproute2
   with extack support when the kernel has no gtp
v5:
 - ynl: add CFLAGS_gtp so the generated code builds with older headers
 - spec: doc fixes, 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

v6: https://lore.kernel.org/netdev/20261013031000.528393-1-anilkaushikwireless@gmail.com/
v5: https://lore.kernel.org/netdev/20261012024800.400616-1-anilkaushikwireless@gmail.com/
v4: https://lore.kernel.org/netdev/20261010105740.223992-1-anilkaushikwireless@gmail.com/
v3: https://lore.kernel.org/netdev/20261009060615.4177402-1-anilkaushikwireless@gmail.com/
v2: https://lore.kernel.org/netdev/20261008181031.4129029-1-anilkaushikwireless@gmail.com/

Anil Kaushik (4):
  gtp: set a valid genl command in PDP context get and dump replies
  gtp: hold RCU for the device lookup when adding a PDP context
  netlink: specs: add genetlink-legacy spec for GTP
  selftests: net: add a test for the gtp netlink family

 Documentation/netlink/specs/gtp.yaml          | 196 ++++++++++++++++++
 MAINTAINERS                                   |   2 +
 drivers/net/gtp.c                             |   7 +-
 tools/net/ynl/Makefile.deps                   |   1 +
 tools/testing/selftests/net/Makefile          |   1 +
 tools/testing/selftests/net/config            |   1 +
 tools/testing/selftests/net/gtp.py            | 123 +++++++++++
 .../testing/selftests/net/lib/py/__init__.py  |   5 +-
 tools/testing/selftests/net/lib/py/ynl.py     |   9 +-
 9 files changed, 340 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/netlink/specs/gtp.yaml
 create mode 100755 tools/testing/selftests/net/gtp.py

-- 
2.25.1