Modern network interface controllers usually support multiple receive and transmit queues. Each queue may have its own parameters. For example, Intel XL710/X710 hardware supports per queue interrupt moderation. However, current ethtool does not support per queue parameters option. User has to set parameters for the whole NIC. This series extends ethtool to support per queue parameters option.
Since the support of per queue parameters vary with different cards, it is impossible to address all cards in one patch. This series only supports per queue coalesce options on i40e driver. The framework used in the patch can be easily extended to other cards and parameters. The lib bitmap needs to be extended to facilitate exchanging queue bitmaps between user space and kernel space. Two patches from David's latest V6 patch series are also cited in this series. You may refer to https://lwn.net/Articles/672517/ for more details. Changes since V4: - Modify set/get_per_queue_coalesce function description - Change the queue number to be u32 - Correct an error of calculating coalesce backup buffer address - Rename queue_num to n_queues - Don't log error message in __i40e_get_coalesce Changes since V3: - Based on David's lib bitmap. - ETHTOOL_PERQUEUE should be handled before the containing switch - Make the rollback code unconditional - some minor changes according to Ben's feedback Changes since V2: - Add queue-specific settings for interrupt moderation in i40e Changes since V1: - Checking the sub-command number to determine whether the command requires CAP_NET_ADMIN - Refine the struct ethtool_per_queue_op and improve the comments - Use bitmap functions to parse queue mask - Improve comments - Use bitmap functions to parse queue mask - Improve comments - Add rollback support - Correct the way to find the vector for specific queue. David Decotigny (2): lib/bitmap.c: conversion routines to/from u32 array test_bitmap: unit tests for lib/bitmap.c Kan Liang (6): net/ethtool: introduce a new ioctl for per queue setting net/ethtool: support get coalesce per queue net/ethtool: support set coalesce per queue i40e: queue-specific settings for interrupt moderation i40e/ethtool: support coalesce getting by queue i40e/ethtool: support coalesce setting by queue drivers/net/ethernet/intel/i40e/i40e.h | 7 -- drivers/net/ethernet/intel/i40e/i40e_debugfs.c | 15 ++- drivers/net/ethernet/intel/i40e/i40e_ethtool.c | 151 +++++++++++++++++-------- drivers/net/ethernet/intel/i40e/i40e_main.c | 12 +- drivers/net/ethernet/intel/i40e/i40e_txrx.c | 9 +- drivers/net/ethernet/intel/i40e/i40e_txrx.h | 8 ++ include/linux/bitmap.h | 6 + include/linux/ethtool.h | 15 ++- include/uapi/linux/ethtool.h | 17 +++ lib/Kconfig.debug | 8 ++ lib/Makefile | 1 + lib/bitmap.c | 86 ++++++++++++++ net/core/ethtool.c | 121 +++++++++++++++++++- tools/testing/selftests/lib/Makefile | 2 +- 14 files changed, 385 insertions(+), 73 deletions(-) -- 1.8.3.1
