Greetings:

Welcome to v7. Added CONFIG_XDP_SOCKETS to the selftests/driver/net kernel config in patch 3. Updated the xdp_helper.c to return -1 on AF_XDP non-existence, and updated queues.py to skip the test if AF_XDP does not exist (but fail in other failure cases). Tested on kernels with and without CONFIG_XDP_SOCKETS enabled.

This is an attempt to followup on something Jakub asked me about [1], adding an xsk attribute to queues and more clearly documenting which queues are linked to NAPIs...

After the RFC [2], Jakub suggested creating an empty nest for queues which have a pool, so I've adjusted this version to work that way.

The nest can be extended in the future to express attributes about XSK as needed. Queues which are not used for AF_XDP do not have the xsk attribute present.

I've run the included test on: - my mlx5 machine (via NETIF=) - without setting NETIF

And the test seems to pass in both cases.

Thanks, Joe

[1]: https://lore.kernel.org/netdev/20250113143109.60afa59a@kernel.org/ [2]: https://lore.kernel.org/netdev/20250129172431.65773-1-jdamato@fastly.com/

v7: - Added CONFIG_XDP_SOCKETS to selftests/driver/net/config as suggested by Stanislav. - Updated xdp_helper.c to return -1 for AF_XDP non-existence, but 1 for other failures. - Updated queues.py to mark test as skipped if AF_XDP does not exist.

v6: https://lore.kernel.org/bpf/20250210193903.16235-1-jdamato@fastly.com/ - Added ifdefs for CONFIG_XDP_SOCKETS in patch 2 as Stanislav suggested.

v5: https://lore.kernel.org/bpf/20250208041248.111118-1-jdamato@fastly.com/ - Removed unused ret variable from patch 2 as Simon suggested.

v4: https://lore.kernel.org/lkml/20250207030916.32751-1-jdamato@fastly.com/ - Add patch 1, as suggested by Jakub, which adds an empty nest helper. - Use the helper in patch 2, which makes the code cleaner and prevents a possible bug.

v3: https://lore.kernel.org/netdev/20250204191108.161046-1-jdamato@fastly.com/ - Change comment format in patch 2 to avoid kdoc warnings. No other changes.

v2: https://lore.kernel.org/all/20250203185828.19334-1-jdamato@fastly.com/ - Switched from RFC to actual submission now that net-next is open - Adjusted patch 1 to include an empty nest as suggested by Jakub - Adjusted patch 2 to update the test based on changes to patch 1, and to incorporate some Python feedback from Jakub :)

rfc: https://lore.kernel.org/netdev/20250129172431.65773-1-jdamato@fastly.com/

Joe Damato (3): netlink: Add nla_put_empty_nest helper netdev-genl: Add an XSK attribute to queues selftests: drv-net: Test queue xsk attribute

Documentation/netlink/specs/netdev.yaml | 13 ++- include/net/netlink.h | 15 +++ include/uapi/linux/netdev.h | 6 ++ net/core/netdev-genl.c | 12 +++ tools/include/uapi/linux/netdev.h | 6 ++ .../testing/selftests/drivers/net/.gitignore | 2 + tools/testing/selftests/drivers/net/Makefile | 3 + tools/testing/selftests/drivers/net/config | 1 + tools/testing/selftests/drivers/net/queues.py | 42 +++++++- .../selftests/drivers/net/xdp_helper.c | 98 +++++++++++++++++++ 10 files changed, 194 insertions(+), 4 deletions(-) create mode 100644 tools/testing/selftests/drivers/net/.gitignore create mode 100644 tools/testing/selftests/drivers/net/xdp_helper.c

base-commit: 4e41231249f4083a095085ff86e317e29313c2c3