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@xxxxxxxxxx/ [1] Suggested-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx> Tested-by: Lei Yang <leiyang@xxxxxxxxxx> --- 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@xxxxxxxxxx --- 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@xxxxxxxxxx --- Breno Leitao (7): 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: virtio_net: add get_rxrings ethtool callback for RX ring queries drivers/net/virtio_net.c | 15 ++------- include/linux/ethtool.h | 2 ++ net/ethtool/ioctl.c | 81 +++++++++++++++++++++++++++++++++++++----------- 3 files changed, 68 insertions(+), 30 deletions(-) --- base-commit: 1f24a240974589ce42f70502ccb3ff3f5189d69a change-id: 20250905-gxrings-a2ec22ee2aec Best regards, -- Breno Leitao <leitao@xxxxxxxxxx>
