Support for reading RX_FREQUENCY_OFFSET_PPM, RX_SNR and FEC_CORRECTED_BITS with SAI #1846
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This change includes support for reading the following PHY layer diagnostics in SAI -
RX_FREQUENCY_OFFSET_PPM - Per lane frequency offset observed at the receiver serdes
RX_SNR - Per lane Signal to Noise ratio observed at the receiver serdes
Note that the units chosen (value reported as a U16 in units of 1/256dB) to represent this value in SAI is similar to how transceiver management standards like SFF-8636 and CMIS represent them.
TOTAL FEC CORRECTED BITS - Represents the total bits corrected by the FEC (Forward Error Correction) as a monotonically incrementing counter. Note that SAI today has support for reading FEC Corrected codewords and symbols, but not the total corrected bits. The corrected bits counter will help in providing an accurate representation of the bit error rate on a link.
These are some useful diagnostics for debugging a link down or a link flap issue.