[net-next v2 0/1] hyperv: Link queues to NAPIs

[Joe Damato <jdamato@fastly.com>]

Greetings:

Welcome to v2.

This was previously an RFC [1], see changelog below.

I've only compile tested this series; I don't have the software for testing
this so I am hoping some one from Microsoft can review and test this
following the instructions below :)

This change allows users to query the mapping of queues to NAPIs using
the netdev-genl interface.

Once this patch has been applied, this can be tested using the cli included
in the kernel tree like this:

$ ./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \
                         --dump queue-get --json='{"ifindex": 2}'

Substituting the ifindex above for the correct ifindex on your system
(which is, presumably, a hyper-V VM).

A sample of expected output would look like:

[{'id': 0, 'ifindex': 2, 'napi-id': 145, 'type': 'rx'},
 {'id': 0, 'ifindex': 2, 'napi-id': 145, 'type': 'tx'}]

Which shows a mapping of queue ID (0) to NAPI ID (145) for both RX and TX
queues. Having this mapping is extremely useful for user apps for a variety
of use cases, including epoll-based busy poll which relies on the NAPI ID.

It would be really great to add support for this API to hyper-V so that
applications (including CI and automated testing facilities) could make use
of this API in VMs.

Sorry, I don't know much at all about hyper-V, but please let me know if
there is anything I can do to help.

Thanks,
Joe

[1]: https://lore.kernel.org/netdev/20240924234851.42348-1-jdamato@fastly.com/

v2:
  - Added Haiyang Zhang's Reviewed-by
  - Added Shradha Gupta's Tested-by
  - Commit message updated to include test output from Shradha
  - Wrapped lines to 80 characters, as suggested by Simon Horman (no
    functional changes introduced)

Joe Damato (1):
  hv_netvsc: Link queues to NAPIs

 drivers/net/hyperv/netvsc.c       | 13 ++++++++++++-
 drivers/net/hyperv/rndis_filter.c |  9 +++++++--
 2 files changed, 19 insertions(+), 3 deletions(-)

-- 
2.34.1