Re: [PATCH v3 1/1] wcn36xx: Add RX frame SNR as a source of system entropy

On Thu, 15 Sept 2022 at 02:41, Bryan O'Donoghue [off-list ref]
wrote:

The signal-to-noise-ratio SNR is returned by the wcn36xx firmware for each
received frame. SNR represents all of the unwanted interference signal
after filtering out the fundamental frequency and harmonics of the
frequency.

Noise can come from various electromagnetic sources, from temperature
affecting the performance hardware components or quantization effects
converting from analog to digital domains.

The SNR value returned by the WiFi firmware then is a good source of
entropy.

Other WiFi drivers offer up the noise component of the FFT as an entropy
source for the random pool e.g.

commit 2aa56cca3571 ("ath9k: Mix the received FFT bins to the random

pool")

I attended Jason's talk on sources of randomness at Plumbers and it
occurred to me that SNR is a reasonable candidate to add.

Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

Acked-by: Loic Poulain <redacted>