Re: [PATCH net-next] macsec: introduce default_async_crypto sysctl

2023-08-24, 13:08:41 -0400, Scott Dial wrote:

On 8/24/2023 9:01 AM, Sabrina Dubroca wrote:

quoted

2023-08-23, 16:22:31 -0400, Scott Dial wrote:

quoted

AES-NI's implementation of gcm(aes) requires the FPU, so if it's busy the
decrypt gets stuck on the cryptd queue, but that queue is not
order-preserving.

It should be (per CPU [*]). The queue itself is a linked list, and if we
have requests on the queue we don't let new requests skip the queue.

My apologies, I'll be the first to admit that I have not tracked all of the
code changes to either the macsec driver or linux-crypto since I first made
the commit. This comment that requests are queued forced me to review the
code again and it appears that the queueing issue was resolved in v5.2-rc1
with commit 1661131a0479, so I no longer believe we need the
CRYPTO_ALG_ASYNC since v5.2 and going forward.

Are you sure about this? 1661131a0479 pre-dates your patch by over a
year.

And AFAICT, that series only moved the existing FPU usable +
cryptd_aead_queued tests from AESNI's implementation of gcm(aes) to
common SIMD helpers.

-- 
Sabrina