[net-next,0/3] mlx4: Add support for netdev-genl API

Message

Joe Damato April 23, 2024, 7:49 p.m. UTC

Hi:

This series adds support to mlx4 for the netdev-genl API which makes it
much easier for users and user programs to map NAPI IDs back to
ifindexes, queues, and IRQs. This is extremely useful for a number of
use cases, including epoll-based busy poll.

In addition, this series includes a patch to generate per-queue
statistics using the netlink API, as well.

To facilitate the stats, patch 1/3 makes use of an existing field,
"dropped" which was already being exported in the ethtool stats by the
driver, but was never incremented. As of patch 1/3, it is now being
incremented by the driver in an appropriate place and used in patch 3/3
as alloc_fail.

Please note: I do not have access to mlx4 hardware, but I've been
working closely with Martin Karsten from University of Waterloo (CC'd)
who has very graciously tested my patches on their mlx4 hardware (hence
his Tested-by attribution in each commit). His latest research work is
particularly interesting [1] and this series helps to support that (and
future) work.

[1]: https://dl.acm.org/doi/pdf/10.1145/3626780

Thanks,
Joe

Joe Damato (3):
  net/mlx4: Track RX allocation failures in a stat
  net/mlx4: link NAPI instances to queues and IRQs
  net/mlx4: support per-queue statistics via netlink

 drivers/net/ethernet/mellanox/mlx4/en_cq.c    | 14 +++
 .../net/ethernet/mellanox/mlx4/en_netdev.c    | 91 +++++++++++++++++++
 drivers/net/ethernet/mellanox/mlx4/en_port.c  |  4 +-
 drivers/net/ethernet/mellanox/mlx4/en_rx.c    |  4 +-
 drivers/net/ethernet/mellanox/mlx4/mlx4_en.h  |  1 +
 5 files changed, 112 insertions(+), 2 deletions(-)