linux-kernel - [PATCH net-next v3 0/8] net: ethtool: add dedicated GRXRINGS driver callbacks

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Message-Id: <20250915-gxrings-v3-0-bfd717dbcaad@debian.org>
Date: Mon, 15 Sep 2025 03:47:25 -0700
From: Breno Leitao <leitao@...ian.org>
To: Andrew Lunn <andrew@...n.ch>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
 kuba@...nel.org, Simon Horman <horms@...nel.org>, 
 "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>, 
 Andrew Lunn <andrew+netdev@...n.ch>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org, 
 virtualization@...ts.linux.dev, Breno Leitao <leitao@...ian.org>, 
 Lei Yang <leiyang@...hat.com>, kernel-team@...a.com
Subject: [PATCH net-next v3 0/8] net: ethtool: add dedicated GRXRINGS
 driver callbacks

This patchset introduces a new dedicated ethtool_ops callback,
.get_rx_ring_count, which enables drivers to provide the number of RX
rings directly, improving efficiency and clarity in RX ring queries and
RSS configuration.

Number of drivers implements .get_rxnfc callback just to report the ring
count, so, having a proper callback makes sense and simplify .get_rxnfc
(in some cases remove it completely).

This has been suggested by Jakub, and follow the same idea as RXFH
driver callbacks [1].

This also port virtio_net to this new callback. Once there is consensus
on this approach, I can start moving the drivers to this new callback.

Link: https://lore.kernel.org/all/20250611145949.2674086-1-kuba@kernel.org/ [1]

Suggested-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Breno Leitao <leitao@...ian.org>
Tested-by: Lei Yang <leiyang@...hat.com>
---
Changes in v3:
- Make ethtool_get_rx_ring_count() non static and use it in rss_set_prep_indir()
- Check return function of ethtool_get_rx_ring_count() in
  ethtool_get_rx_ring_count() (Jakub)
- Link to v2: https://lore.kernel.org/r/20250912-gxrings-v2-0-3c7a60bbeebf@debian.org

Changes in v2:
- rename get_num_rxrings() to ethtool_get_rx_ring_count() (Jakub)
- initialize struct ethtool_rxnfc() (Jakub)
- Link to v1: https://lore.kernel.org/r/20250909-gxrings-v1-0-634282f06a54@debian.org
---
Changes v1 from RFC:
- Renaming and changing the return type of .get_rxrings() callback (Jakub)
- Add the docstring format for the new callback (Simon)
- Remove the unecessary WARN_ONCE() (Jakub)
- Link to RFC: https://lore.kernel.org/r/20250905-gxrings-v1-0-984fc471f28f@debian.org

---
Breno Leitao (8):
      net: ethtool: pass the num of RX rings directly to ethtool_copy_validate_indir
      net: ethtool: add support for ETHTOOL_GRXRINGS ioctl
      net: ethtool: remove the duplicated handling from ethtool_get_rxrings
      net: ethtool: add get_rx_ring_count callback to optimize RX ring queries
      net: ethtool: update set_rxfh to use ethtool_get_rx_ring_count helper
      net: ethtool: update set_rxfh_indir to use ethtool_get_rx_ring_count helper
      net: ethtool: use the new helper in rss_set_prep_indir()
      net: virtio_net: add get_rxrings ethtool callback for RX ring queries

 drivers/net/virtio_net.c | 15 ++-------
 include/linux/ethtool.h  |  2 ++
 net/ethtool/common.h     |  2 ++
 net/ethtool/ioctl.c      | 88 ++++++++++++++++++++++++++++++++++++++----------
 net/ethtool/rss.c        | 15 ++++-----
 5 files changed, 84 insertions(+), 38 deletions(-)
---
base-commit: 5b5ba63a54cc7cb050fa734dbf495ffd63f9cbf7
change-id: 20250905-gxrings-a2ec22ee2aec

Best regards,
--  
Breno Leitao <leitao@...ian.org>