[net-next,v4,0/4] virtio-net: Link queues to NAPIs

Message

Joe Damato Feb. 25, 2025, 2:04 a.m. UTC

Greetings:

Welcome to v4.

Jakub recently commented [1] that I should not hold this series on
virtio-net linking queues to NAPIs behind other important work that is
on-going and suggested I re-spin, so here we are :)

This is a significant refactor from the rfcv3 and as such I've dropped
almost all of the tags from reviewers except for patch 4 (sorry Gerhard
and Jason; the changes are significant so I think patches 1-3 need to be
re-reviewed).

As per the discussion on the v3 [2], now both RX and TX NAPIs use the
API to link queues to NAPIs. Since TX-only NAPIs don't have a NAPI ID,
commit 6597e8d35851 ("netdev-genl: Elide napi_id when not present") now
correctly elides the TX-only NAPIs (instead of printing zero) when the
queues and NAPIs are linked.

See the commit message of patch 3 for an example of how to get the NAPI
to queue mapping information.

See the commit message of patch 4 for an example of how NAPI IDs are
persistent despite queue count changes.

Thanks,
Joe

v4:
  - Dropped Jakub's patch (previously patch 1).
  - Significant refactor from v3 affecting patches 1-3.
  - Patch 4 added tags from Jason and Gerhard.

rfcv3: https://lore.kernel.org/netdev/[e-mail]/
  - patch 3:
    - Removed the xdp checks completely, as Gerhard Engleder pointed
      out, they are likely not necessary.

  - patch 4:
    - Added Xuan Zhuo's Reviewed-by.

v2: https://lore.kernel.org/netdev/[e-mail]/
  - patch 1:
    - New in the v2 from Jakub.

  - patch 2:
    - Previously patch 1, unchanged from v1.
    - Added Gerhard Engleder's Reviewed-by.
    - Added Lei Yang's Tested-by.

  - patch 3:
    - Introduced virtnet_napi_disable to eliminate duplicated code
      in virtnet_xdp_set, virtnet_rx_pause, virtnet_disable_queue_pair,
      refill_work as suggested by Jason Wang.
    - As a result of the above refactor, dropped Reviewed-by and
      Tested-by from patch 3.

  - patch 4:
    - New in v2. Adds persistent NAPI configuration. See commit message
      for more details.

v1: https://lore.kernel.org/netdev/[e-mail]/

[1]: https://lore.kernel.org/netdev/[e-mail]/
[2]: https://lore.kernel.org/netdev/[e-mail]/

Joe Damato (4):
  virtio-net: Refactor napi_enable paths
  virtio-net: Refactor napi_disable paths
  virtio-net: Map NAPIs to queues
  virtio_net: Use persistent NAPI config

 drivers/net/virtio_net.c | 100 ++++++++++++++++++++++++++++-----------
 1 file changed, 73 insertions(+), 27 deletions(-)


base-commit: 7183877d6853801258b7a8d3b51b415982e5097e