Re: [PATCH net-next v5 1/5] net: cadence: macb: add EEE LPI statistics counters

[Claudiu Beznea <claudiu.beznea@tuxon.dev>]

On 2/27/26 17:06, Nicolai Buchwitz wrote:
> The GEM MAC provides four read-only, clear-on-read LPI statistics
> registers at offsets 0x270-0x27c:
> 
>    GEM_RXLPI     (0x270): RX LPI transition count (16-bit)
>    GEM_RXLPITIME (0x274): cumulative RX LPI time (24-bit)
>    GEM_TXLPI     (0x278): TX LPI transition count (16-bit)
>    GEM_TXLPITIME (0x27c): cumulative TX LPI time (24-bit)
> 
> Add register offset definitions, extend struct gem_stats with
> corresponding u64 software accumulators, and register the four
> counters in gem_statistics[] so they appear in ethtool -S output.
> Because the hardware counters clear on read, the existing
> macb_update_stats() path accumulates them into the u64 fields on
> every stats poll, preventing loss between userspace reads.
> 
> These registers are present on SAMA5D2, SAME70, PIC32CZ, and RP1
> variants of the Cadence GEM IP and have been confirmed on RP1 via
> devmem reads.
> 
> Reviewed-by: Théo Lebrun<theo.lebrun@bootlin.com>
> Signed-off-by: Nicolai Buchwitz<nb@tipi-net.de>

Reviewed-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>