linux-kernel - [PATCH net-next V2 0/3] net/mlx5e: Add support for PCIe congestion events

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Message-ID: <1752130292-22249-1-git-send-email-tariqt@nvidia.com>
Date: Thu, 10 Jul 2025 09:51:29 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>
CC: Saeed Mahameed <saeed@...nel.org>, Gal Pressman <gal@...dia.com>, "Leon
 Romanovsky" <leon@...nel.org>, Saeed Mahameed <saeedm@...dia.com>, "Tariq
 Toukan" <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>, Jonathan Corbet
	<corbet@....net>, <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH net-next V2 0/3] net/mlx5e: Add support for PCIe congestion events

Hi,

This is V2. Previous one submitted by Mark.
Find it here:
https://lore.kernel.org/all/20250619113721.60201-1-mbloch@nvidia.com/

Find detailed feature description by Dragos below [1].

Regards,
Tariq

V2:
- Rebase on top of the IFC patches, they got pulled through mlx5-next.

[1]
PCIe congestion events are events generated by the firmware when the
device side has sustained PCIe inbound or outbound traffic above
certain thresholds. The high and low threshold are hysteresis thresholds
to prevent flapping: once the high threshold has been reached, a low
threshold event will be triggered only after the bandwidth usage went
below the low threshold.

This series adds support for receiving and exposing such events as
ethtool counters.

2 new pairs of counters are exposed: pci_bw_in/outbound_high/low. These
should help the user understand if the device PCI is under pressure.
The thresholds are configurable via sysfs when the feature is supported.

Dragos Tatulea (3):
  net/mlx5e: Create/destroy PCIe Congestion Event object
  net/mlx5e: Add device PCIe congestion ethtool stats
  net/mlx5e: Make PCIe congestion event thresholds configurable

 .../ethernet/mellanox/mlx5/counters.rst       |  32 ++
 .../net/ethernet/mellanox/mlx5/core/Makefile  |   2 +-
 drivers/net/ethernet/mellanox/mlx5/core/en.h  |   2 +
 .../mellanox/mlx5/core/en/pcie_cong_event.c   | 464 ++++++++++++++++++
 .../mellanox/mlx5/core/en/pcie_cong_event.h   |  11 +
 .../net/ethernet/mellanox/mlx5/core/en_main.c |   3 +
 .../ethernet/mellanox/mlx5/core/en_stats.c    |   1 +
 .../ethernet/mellanox/mlx5/core/en_stats.h    |   1 +
 drivers/net/ethernet/mellanox/mlx5/core/eq.c  |   4 +
 9 files changed, 519 insertions(+), 1 deletion(-)
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/pcie_cong_event.c
 create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/en/pcie_cong_event.h

base-commit: c65d34296b2252897e37835d6007bbd01b255742
-- 
2.31.1