Merge branch 'net-mlx5e-add-support-for-pcie-congestion-events'

Tariq Toukan says:

====================
net/mlx5e: Add support for PCIe congestion events

Dragos says:

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.

Planned followup patches:
- Allow configuration of thresholds through devlink.
- Add ethtool counter for wakeups which did not result in any state
  change.
====================

Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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