netdev - [RFC PATCH net-next 0/2] Configuring PFC stall prevention via ethtool

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Date:   Wed, 15 Nov 2017 21:00:09 +0200
From:   Eran Ben Elisha <eranbe@...lanox.com>
To:     netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>,
        "John W. Linville" <linville@...driver.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Cc:     Gal Pressman <galp@...lanox.com>,
        Ariel Almog <ariela@...lanox.com>,
        Eran Ben Elisha <eranbe@...lanox.com>,
        Inbar Karmy <inbark@...lanox.com>
Subject: [RFC PATCH net-next 0/2] Configuring PFC stall prevention via ethtool

From: Inbar Karmy <inbark@...lanox.com>

This RFC adds support for configuring PFC stall prevention through ethtool.

In the event where the device unexpectedly becomes unresponsive for a long
period of time, flow control mechanism may propagate pause frames which will
cause congestion spreading to the entire network.

To prevent this scenario, the device may implement a protection mechanism for
monitoring and resolving such state.  The following patches allow the user to
control the stall prevention functionality.

PFC stall prevention configuration is done via ethtool -a (pause).
Two modes are introduced:
Default - current behavior per driver.
Auto - protection mechanism controlled automatically by the driver.
Due to lack of extension ability of ethtool_ops set_pauseparam, a new
ethtool_ops get_pfc_prevention_mode is introduced.

I based this patch set on net-next commit 50895b9de1d3("tcp: highest_sack fix
").

Inbar Karmy (2):
  ethtool: Add support for configuring PFC stall prevention in ethtool
  net/mlx5e: PFC stall prevention support

 .../net/ethernet/mellanox/mlx5/core/en_ethtool.c   | 51 ++++++++++++++++++++
 drivers/net/ethernet/mellanox/mlx5/core/port.c     | 56 ++++++++++++++++++----
 include/linux/ethtool.h                            |  8 ++++
 include/linux/mlx5/mlx5_ifc.h                      | 22 +++++++--
 include/linux/mlx5/port.h                          |  5 ++
 include/uapi/linux/ethtool.h                       | 20 ++++++++
 net/core/ethtool.c                                 | 39 +++++++++++++++
 7 files changed, 188 insertions(+), 13 deletions(-)

-- 
1.8.3.1