With TX pause enabled, if a device cannot deliver received frames to
the stack (e.g., during a system hang), it may generate excessive pause
frames causing a pause storm. This series updates the uAPI to track TX
pause storm events as part of the pause stats (p1), propose to use the
existing knob (pfc-prevention-tout) to configure storm watchdog (p2),
adds pause storm protection support for fbnic (p3), and leverages p1
to provide observability into these events for fbnic (p4) and mlnx5 (p5)
drivers.

---
Changelog:
V2:
 - Clarify pfc-prevention-tout applies to general pause, not just PFC
   (P2)
 - Add pause storm watchdog timeout configuration via pfc-prevention-tout
   (P3)
 - mlx5: Report device stall prevention events (errors) in pause stats
   (P5)

V1: https://lore.kernel.org/20260122192158.428882-1-mohsin.bashr@gmail.com/ (local)

Mohsin Bashir (5):
  net: ethtool: Track pause storm events
  net: ethtool: Update doc for tunable
  eth: fbnic: Add protection against pause storm
  eth: fbnic: Fetch TX pause storm stats
  eth: mlx5: Move pause storm errors to pause stats

 Documentation/netlink/specs/ethtool.yaml      |  13 +++
 .../ethernet/mellanox/mlx5/core/en_stats.c    |  25 ++++
 drivers/net/ethernet/meta/fbnic/fbnic.h       |   3 +
 drivers/net/ethernet/meta/fbnic/fbnic_csr.h   |  11 ++
 .../net/ethernet/meta/fbnic/fbnic_ethtool.c   |  46 ++++++++
 .../net/ethernet/meta/fbnic/fbnic_hw_stats.h  |   1 +
 drivers/net/ethernet/meta/fbnic/fbnic_irq.c   |   2 +
 drivers/net/ethernet/meta/fbnic/fbnic_mac.c   | 110 ++++++++++++++++++
 drivers/net/ethernet/meta/fbnic/fbnic_mac.h   |  27 +++++
 drivers/net/ethernet/meta/fbnic/fbnic_pci.c   |   5 +
 include/linux/ethtool.h                       |   2 +
 include/uapi/linux/ethtool.h                  |   2 +-
 .../uapi/linux/ethtool_netlink_generated.h    |   1 +
 net/ethtool/pause.c                           |   4 +-
 14 files changed, 250 insertions(+), 2 deletions(-)

-- 
2.47.3