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

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Message-Id: <20240930172709.57417-1-jdamato@fastly.com>
Date: Mon, 30 Sep 2024 17:27:08 +0000
From: Joe Damato <jdamato@...tly.com>
To: netdev@...r.kernel.org
Cc: haiyangz@...rosoft.com,
	shradhagupta@...ux.microsoft.com,
	horms@...nel.org,
	Joe Damato <jdamato@...tly.com>,
	"David S. Miller" <davem@...emloft.net>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Dexuan Cui <decui@...rosoft.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Wei Liu <wei.liu@...nel.org>,
	linux-hyperv@...r.kernel.org (open list:Hyper-V/Azure CORE AND DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Subject: [net-next v2 0/1] hyperv: Link queues to NAPIs

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